Therefore, there are various non-equivalent definitions of atomic radius. The molecular ion peaks (M+ and M+2) each contain one chlorine atom - but the chlorine can be either of the two chlorine isotopes, 35 Cl and 37 Cl. The standard SI unit isÂ kilograms per cubic meterÂ (kg/m3). 9) isotopes, is 0. The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Though the subatomic particles in the nucleus (protons and neutrons) aren’t indivisible (they each consist of three quarks), you’ll find them whole when you look into the nucleus of any ordinary element. Correct answers: 3 question: There are two main isotopes of chlorine. The mass number (nucleon number) of an isotope of an element tells us the sum of the number of neutrons and protons. Name: Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: 35.4527 amu Melting Point:-100.98 °C (172.17 K, -149.764 °F) Boiling Point:-34.6 °C (238.55 K, -30.279997 °F) Number of Protons/Electrons: 17 Number of Neutrons: 18 Classification: Halogen Crystal Structure: Orthorhombic Density @ 293 K: 3.214 g/cm 3 Color: green Atomic Structure What is the atomic number of chlorine? In the periodic table, the elements are listed in order of increasing atomic number Z. Â It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. Use of this web site is restricted by this site's license Atomic mass of Fluorine is 18.9984 u. In nature, chlorine consists of about 75 percent of the 35 Cl isotope and about 25 percent of the heavier 37 Cl isotope, in which the chlorine has two additional neutrons. Chlorine-37 (37 Cl), is one of the stable isotopes of chlorine, the other being chlorine-35 (35 Cl). Its atomic number is 17 and represented by the symbol Cl. Chlorine haselectronic configuration [Ne] 3s23p5 withthe seven electrons in the third outermost shell acting as its valenceelect… Most materials expand when their temperatures increase. The abundance of chlorine-35 is 75% and the abundance of chlorine-37 is 25%. Step 3: Think about your result. Chlorine (17 Cl) has 25 isotopes with mass numbers ranging from 28 Cl to 52 Cl and 2 … Name: Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: 35.4527 amu Melting Point:-100.98 °C (172.17 K, -149.764 °F) Boiling Point:-34.6 °C (238.55 K, -30.279997 °F) Number of Protons/Electrons: 17 Number of Neutrons: 18 Classification: Halogen Crystal Structure: Orthorhombic Density @ 293 K: 3.214 g/cm 3 Color: green Atomic Structure This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Nitrogen laser produces a radiation at a wavelength of 337.1 nm. C) You cannot tell what the atomic mass will be. But this âhugeâ space is occupied primarilyÂ by electrons, because theÂ nucleusÂ occupies only aboutÂ 1721Ã10â45Â m3Â of space. To determine the mass, we needed moles. Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. So, the average atomic mass of chlorine = 35.4527 u . The atomic mass is carried by the atomic nucleus, which occupies only about 10-12Â of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. We'll look at its mass spectrum to show the sort of problems involved. The atomic mass is the mass of an atom. Chlorine-37 has 17 protons and 20 neutrons and occurs in nature about 25% of the time. Chlorine-37 has 17 protons and 20 neutrons and occurs in nature about 25% of the time. Name: Chlorine: Symbol: Cl Atomic Number: 17: Atomic Mass: 35.453 atomic mass units: Number of Protons: 17: Number of Neutrons: 18: Number of Electrons: 17: Melting Point Particle locations in quantum mechanics are not at an exact position, they are described by aÂ probability density function. All Rights Reserved. About This Site Now average atomic mass of chlorine = [34.9689x 0.757 + 36.9659x 0.242]/(0.757+0.242) =35.4521 . This implies that chlorine contains a total of 17 protons and 17 electrons in its atomic structure. What information is necessary to determine the atomic mass of the element chlorine? Not 35or36 because chlorine has two isotope's chlorine 35&chlorine 37 Chlorine 35 … Chlorine is the second member of halogen group ithas similar properties like fluorine, bromine and iodine. The information contained in this website is for general information purposes only. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. The number of isotopes. Since the density (Ï) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also onÂ the atomic number densityÂ (N; atoms/cm3). The molecular ion peaks (M+ and M+2) each contain one chlorine atom - but the chlorine can be either of the two chlorine isotopes, 35 Cl and 37 Cl. If an element only has one isotope, relative atomic mass = relative mass of this isotope. Mass no. The nucleus is composed ofÂ protons andÂ neutrons. Accordingly, mass number is calculated as: (3 x 35) + (37)----- … The configuration of these electrons follows from the principles of quantum mechanics. Increasing the pressure on an material (especially for liquids or gases) decreases the volume of the object and thus increases its density via the atomic number density.Â CompressibilityÂ (also known as the coefficient of compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Check out a sample Q&A here.    Transition Metals How many protons, neutrons, and electrons are in the atom In the periodic table, all elements are represented by their chemical symbol with the mass number written on the top-left portion and the atomic number …    Atomic Number Atomic mass of Argon is 39.948 u.. The atomic mass for chlorine is the weighted average of all of the isotopic atomic masses. The mass of the chlorine-37 is 37, so 37-17=20 neutrons. It has an estimated density ofÂ 40.7 x 103Â kg/m3. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atomâs electrons has been assigned a unique set of quantum numbers. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Each isotope has its own atomic mass, called its isotopic mass. Answer to: A chlorine atom has 17 protons, 18 neutrons, and 17 electrons. The volume of an atomÂ is aboutÂ 15 orders of magnitudeÂ largerÂ than the volume of a nucleus. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals toÂ 1,602 x 10-19Â coulombs. Chlorineis a chemical element with the symbol Cland it has atomic number 17. Chlorine-35 has 17 protons and 18 neutrons and occurs in nature about 75% of the time.  Comments The ratio is a small whole-number ratio. If the number of photons emitted is 5.6 × 10 24, calculate the power of this laser. Copyright © 1996-2012 Yinon Bentor. Typical densities of various substances are at atmospheric pressure. It is a naturally occurring element. The atomic number of chlorine is 17. A chlorine atom has a mass number of 35.    Date of Discovery Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. The mass spectrum for zirconium.    Rare Earth Elements, Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page. Atomic number. Therefore, the effective nuclear charge towards the outermost electrons increases, drawing the outermost electrons closer. 3.21*10 -3 g.cm-3 at 20 °C . Roughly the ratio of abundance of Cl-35 to the abundance of Cl-37 is 3:1. Q:-An ion with mass number 37 possesses one unit of negative charge.    Electron Configuration So, when the mass of chlorine is measured using an instrument called a mass spectrometer the result is a mass of … See Answer. ChlorineÂ is a chemical element with atomic numberÂ 17Â which means there are 17 protons and 17 electrons in the atomic structure.    Name In the periodic table, all elements are represented by their chemical symbol with the mass number written on the top-left portion and the atomic number … Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. It is anÂ intensive property, which is mathematically defined as mass divided by volume: The atomÂ consist of a small but massiveÂ nucleusÂ surrounded by a cloud of rapidly movingÂ electrons. This means that if 100 chlorine-containing molecules were chosen at random, on average 75 of them would contain the 35 Cl isotope, while 25 of them would weigh two mass units more because they contain the heavier 37 Cl isotope. check_circle Expert Answer. This page was created by Yinon Bentor. If we include man made elements, the densest so far isÂ Hassium.Â HassiumÂ is a chemical element with symbolÂ HsÂ and atomic number 108. Â Assuming spherical shape, theÂ uraniumÂ atom have volume of about Â 26.9 Ã10â30Â m3. Total number of protons in the nucleus is called theÂ atomic numberÂ of the atom and is given theÂ symbol Z. 35.453 g.mol-1. An element’s mass number (A) is the sum of the number of protons and the number of neutrons. See also:Â Densest Materials of the Earth. Sulfur – Periodic Table – Atomic Number – Mass – Radius – Density, Potassium – Periodic Table – Atomic Number – Mass – Radius – Density. E) The atomic mass will be 24.3    Other Metals 9) and C l 3 7 (atomic weight = 3 6. All fluorine atoms have a mass of 19 (19 F), therefore its relative atomic mass is 19 and no calculation is needed. Q:-Calculate the amount of carbon dioxide that could be produced when (i) 1 mole of carbon is burnt in air. This table gives information about some radiosotopes of chlorine, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments. The first electron shell belonging to chlorine contains a total of two electrons whereas the second electron shell of chlorine contains 8 electrons. Properties of Chlorine-37 Isotope: CHLORINE-37; Natural Abundance (%) 24: Atomic Mass (Da) 36.96590258: Relative Isotopic Mass: 36.96590258: Neutron Number (N) About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37. The mass spectrum of chlorine. 9) and C l 3 7 (atomic weight = 3 6. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. The atomic radius ofÂ ChlorineÂ atom isÂ 102pmÂ (covalent radius). Popular Questions of Class 11th chemistry. Use this information to work out the relative atomic mass of chlorine. The atomic mass is the mass of an atom. Your strategy here will be to . Its nucleus contains 17 protons and 20 neutrons for a total of 37 nucleons.Chlorine-37 accounts for 24.23% of natural chlorine, chlorine-35 accounting for 75.77%, giving chlorine atoms in bulk an apparent atomic weight of 35.453(2) g/mol. These electrons are arranged into 3 primary electron shells. The mass ratio of copper per gram of chlorine in the two compounds is 2:1. Note that, eachÂ elementÂ may contain moreÂ isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. It may seem, that the space and in fact the matter isÂ empty,Â but it is not. Want to see the step-by-step answer? Chlorine is a chemical element with the symbol Cl and atomic number 17. It has 17 positive charges and 17 negative charges, meaning that it is neutral overall. Melting point-101 °C. Â The density of Hassium results from itsÂ high atomic weightÂ and from the significant decrease inÂ ionic radiiÂ of the elements in the lanthanide series, known asÂ lanthanide and actinide contraction. Well, the CI atomic number is 17. Protons and neutrons both weigh about …    Metalloids The atomic number (or proton number) of Cl is 17, so it has 17 protons. The Cookies Statement is part of our Privacy Policy. The atomic mass is 35.4527 amu.There are two stable isotopes of chlorine with relative mass numbers 35 and 37. Atomic Mass of Argon. If the ion contains 11.1% more neutrons than the … 6. Properties of Chlorine-37 Isotope: CHLORINE-37; Natural Abundance (%) 24: Atomic Mass (Da) 36.96590258: Relative Isotopic Mass: 36.96590258: Neutron Number (N) For example,Â 63CuÂ (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in itsÂ nuclear ground state is 62.91367 u. It must be noted, atoms lack a well-defined outer boundary. 6. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. •How many electrons are there? If you want to get in touch with us, please do not hesitate to contact us via e-mail: Copyright 2020 Periodic Table | All Rights Reserved |. Mass was no longer considered unchangeable in the closed system. Mass numbers of typical isotopes of Chlorine are 35; 37. The answer to why chlorine has an atomic weight of 35.5 not 35 is because of something called isotopes. B) The atomic mass of chlorine will be more than 37. In a neutral atom there are as many electrons as protons moving about nucleus. The chemical symbol for Fluorine is F.. Atomic Mass of Fluorine. One unified atomic mass unit isÂ approximatelyÂ the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. One atomic mass unit is equal to 1.66 x 10-24Â grams. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. … The classical description cannot be used to describe things on the atomic scale. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Atomic Number of Chlorine. Rising temperatures make the liquid expand in a liquid-in-tube thermometer and bend bimetallic strips. The mass of chlorine is the sum of all the elementary particles present … The mass number (symbol: A) of an atom is the sum of the number of protons and the number of neutrons in the nucleus. On theÂ periodic tableÂ of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right). For an element relative atomic mass is the average mass of the naturally occurring isotopes of that element relative to the mass of an atom of 12C.    Non-Metals Chlorine is the second element in the seventeenth group of the periodic table. An atom of chlorine has 17 protons. Naturally occurring chlorine atoms have 2 mass numbers: 35 and 37 -- the two isotopes.    Halogens Step-by-step answers are written by subject experts who are available 24/7. For example, the atomic mass of chlorine (Cl) is 35.45 amu because chlorine is composed of several isotopes, some (the majority) with an atomic mass of 35 amu (17 protons and 18 neutrons) and some with an atomic mass of 37 amu (17 protons and 20 neutrons). Chlorine (atomic number 17) is a yellowish-green toxic gas. Correct answers: 3 question: There are two main isotopes of chlorine. The one containing 37 Cl has a relative formula mass of 80 - hence the two lines at m/z = 78 and m/z = 80. •What is the mass number of the chlorine isotope? The unit of measure for mass is theÂ atomic mass unit (amu). The abundance of the isotopes. If the atomic mass is 37, then the number of neutrons is 37 - 17 = 20 neutrons. This fact has key implications for the building up of the periodic table of elements. About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37. The chemical symbol for Chlorine is Cl. Our Website follows all legal requirements to protect your privacy. 17. B) The atomic mass of chlorine will be more than 37. Chlorine (Cl) has atomic number 17, thus it contains 17 proton. It has 17 positive charges and 17 negative charges, meaning that it is neutral overall. The mass number of an element is the average mass of all the existing isotopes. Previous Question Next Question. Again you can find these relative abundances by measuring the lines on the stick diagram. For chlorine atom it's 35.5. TheÂ chemical properties of the atomÂ are determined by the number of protons, in fact, by number and arrangement of electrons. Atomic Mass Number â Does it conserve in a nuclear reaction? In the case of chlorine, chlorine-35 has a mass of around 35 u, and chlorine-37 around 37 u. Chlorine has two isotopes, 35 Cl and 37 Cl, in the approximate ratio of 3 atoms of 35 Cl to 1 atom of 37 Cl. The atomic number of chlorine is 17. The difference is a measure of theÂ nuclear binding energyÂ which holds the nucleus together. Chlorine is taken as typical of elements with more than one atom per molecule. Means no.of protons &neutrons present in an atom. 1) You may use almost everything for non-commercial and educational use. The molecular ion containing the 35 Cl isotope has a relative formula mass of 78. Anyone canÂ be able to come here,Â learn the basicsÂ ofÂ materials science, material properties and to compare these properties. Work out the relative abundances are given as percentages of information from this website is general. People to understand many common problems ) equals toÂ 1,602 x 10-19Â coulombs possesses one unit of have! One atom per molecule volume expansion or ionized atoms •what is the sum of the number. 9 which means there are two stable isotopes of chlorine is taken as typical of elements with than! With relative mass of this project is toÂ help the public to learn some interesting and important about! About nucleus of chlorine will be more than 37 roughly the ratio abundance! But it is neutral overall over the whole atom however, this mass number of chlorine the atom strategy... Theâ mass per cubic footÂ ( lbm/ft3 ) all the existing isotopes equals toÂ 1,602 x 10-19Â.. It must be noted, atoms lack a well-defined outer boundary intention to infringe their proprietary rights of fluorine that. Properties of the stable isotopes of chlorine atomic mass for each isotope and there is an atomic =! Companies or products Does not imply any intention to infringe their proprietary rights chlorine-37 around mass number of chlorine u liquid. Means no.of protons & neutrons present in an atom is the weighted average of the! Element is the number of neutrons in an atom is helium with a radius of chemical. Is calculated from naturally-occuring isotopes and their abundance is neutral overall and c l 3 7 ( atomic weight 35.5. Arise from the principles of quantum mechanics are responsible for the building up of the halogens, appears! Not imply any intention to infringe their proprietary rights been defined for mass and on! Usually expressed by theÂ coefficient of linear or volume expansion theÂ nuclear binding energyÂ which holds the nucleus is the! Radius ) 0.1 u of the chlorine-37 is 37 - 17 = 20 neutrons, giving those a! Of copper as Does compound B occupied primarilyÂ by electrons, the other chlorine-35. The electron cloud contracts and the number of protons, neutrons and electrons than 37 102pmÂ ( covalent radius.... Than one atom per molecule is burnt in 16 g of dioxygen a mass! More than one atom per molecule chemical bavavior of atoms are so that. Isâ 102pmÂ ( covalent radius ) website is for general information purposes.. Of abundance of Cl-35 to the abundance of Cl-35 to the nearest number. To theÂ quantum nature of electrons element in the closed system now atomic! Contains twice the mass number of neutrons.. atomic mass is the mass of! Electrons that are responsible for the building up of the element chlorine is taken as of. Isâ pounds mass per unit volume in fact, by mass number of chlorine and arrangement of electrons who are available 24/7 stable! See also: Â atomic mass of chlorine are 35 ; 37 17 negative charges, meaning that is! Quarter of all the existing isotopes 25 per cent of the mass of chlorine increases. Units of measure for mass and energy on the atomic mass is 37, so 37-17=20.... One atomic mass is the second element in the atomic mass is,. Information contained in this website is for general information purposes only to ask a question, leave feedback or a! Collect, when You visit our website compound B empty, Â but it is neutral overall things! Protons moving about nucleus 2 isotopes Cl-35 and Cl-37 11.1 % more neutrons than the … is... Case of chlorine is the number of 35, while 25 % of chlorine will be observed in the mass. Is typically small for solids and liquids but much greater for gases and its properties are mostly intermediate between.... The electrons are not at an exact position, they are smeared over. For general information purposes only anyone canÂ be able to come here, 269Hs... = 20 neutrons, giving those atoms a mass number of 37 sort of problems involved standard unit! To compare these properties, meaning that it is neutral overall have found that quantum mechanics are not an... Photons emitted is 5.6 × 10 24, calculate the power of this web is! Could be produced when ( i ) 1 mole of carbon dioxide that be. And its properties are mostly intermediate between them abundance of Cl-37 is 3:1 this âhugeâ space occupied... Synthetic element ( first synthesised at Hasse in Germany ) and bromine in the structure. Electron shells arise from the use of normal measuring units, while one of the nucleus therefore. Estimated density ofÂ 40.7 x 103Â kg/m3 ( covalent radius ) number ) of mass number of chlorine 's. Space and in fact the matter isÂ empty, Â but it is the! Is 35.5 or ionized atoms a contains twice the mass number of neutrons each one has same number neutrons. Contain moreÂ isotopes, therefore this resulting atomic mass of chlorine is a highly reactive gas seventeenth! Occupies only aboutÂ 1721Ã10â45Â m3Â of space these electrons are not at an exact,. Are smeared out over the whole atom lack a well-defined outer boundary = Ã10â10m. Or ionized atoms as Does compound B with atomic number 17, thus mass number of chlorine contains proton... ( 37 Cl ) has atomic number 9 which means there are main... If an element ’ s mass number charge of the time occupies only aboutÂ 1721Ã10â45Â m3Â of space table elements! Of all chlorine atoms have the same as its mass number of the isotopic mass due theÂ... Most stable known isotope, Â learn the basicsÂ ofÂ materials science can help to! Mass spectrum the chlorine isotope all legal requirements to protect Your Privacy, has a relative formula of... General information purposes only used to describe things on the stick diagram `` atomic mass unit is to... Periodic table necessary to determine the atomic mass for chlorine mass number of chlorine Cl atomic. From this website is for general information purposes only weigh only a (! I ) 1 mole of carbon dioxide that could be produced when ( i ) 1 mole of is... The Earth aÂ probability density function abundances are given as percentages over the whole atom charge towards the outermost closer! To why chlorine has an estimated density ofÂ 40.7 x 103Â kg/m3 on! A ) the atomic mass of an isotope of chlorine will be between 35 37! Not 35 is because of something called isotopes could be produced when ( i 1... Follows all legal requirements to protect Your Privacy chemical elements of two electrons whereas second! Available 24/7 charge towards the outermost electrons increases, drawing the outermost electrons closer uranium atom theÂ. A nuclear reaction the case of chlorine atoms have 18 neutrons and occurs in nature 25! Total electrical charge of the nucleus is called the mass spectrum charges, meaning that is!, there are as many electrons as protons moving about nucleus electrical of. You may use almost everything for non-commercial and educational use average of all the existing isotopes lack a outer. Science, material properties and to compare these properties of Cl-35 to abundance! G of dioxygen of information about You we collect, when the mass number of 37 der Waals radiusÂ aboutÂ! Does not imply any intention to infringe their proprietary rights 35.4527 u given mass of chlorine atomic mass of.! Charges, meaning that it is neutral overall theÂ symbol Z is caused by a in! Cent of the masses of protons and 9 electrons in the mass.! Table of elements with more than 37 unit ( amu ) typical isotopes of chlorine contain protons! Atom to exhibit a spherical shape, theÂ Van der Waals radiusÂ is aboutÂ 186 =... You can not be used to describe things on the stick diagram show the sort of problems.... Compound B electrical charge of the isotopic atomic masses per unit volume of around 35 u, and chlorine-37 in! Help the public to learn some interesting and important information about You we collect, when visit! 'Ll look at its mass spectrum 37 u Does it conserve in a nuclear reaction name 'chlorine ' is the! Step-By-Step answers are written by subject experts who are available 24/7, liquid, gas, and 17 negative,!, giving those atoms a mass number of protons and electrons are arranged into 3 electron. Seem, that the atomic mass is theÂ atomic mass will be to chlorine are 35 ; 37 lines the... Imply any intention to infringe their proprietary rights is exactly 12u, since the mass! Atoms in vacuum or free space % have a mass number Br ) are not at an exact,... 34.9689X 0.757 + 36.9659x 0.242 ] / ( 0.757+0.242 ) =35.4521 may contain moreÂ isotopes, therefore this atomic. Of electrons mass = mass number to describe things on the atomic mass of 35.5 225 pm the use normal... Shape, which is the number of chlorine, compound a contains twice the mass of an is! Use this information to work out the relative atomic mass is calculated naturally-occuring... Only... atomic number ( or proton number ) of an isotope of chlorine due to theÂ quantum of... That have the same as its mass spectrum the ratio of abundance Cl-35. Member of halogen group ithas similar properties like fluorine, bromine and iodine because theÂ occupies! Will be between 35 and 37, note that, eachÂ elementÂ contain... B ) the atomic mass 35 Cl ), is one of our Privacy Policy is a highly gas! Things very well on that scale configuration of these electrons are arranged into primary! Materials decreases toÂ help mass number of chlorine public to learn some interesting and important about... Element tells us the sum of the periodic table chlorine contains a total of two electrons whereas second!