Chlorine, achemical element with the price Cl and also atomic number 17, is an extremely reactiveelement and strongest oxidizing agent as it has the highest electron affinity andthird highest electronegativity follow to the Pauli scale among theelements.

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One the the mostcommon link in the chemistry industry and also real-life intake constituentsodium chloride (NaCl) includes chlorine. The is used as sanitation, disinfection,antiseptics, tools in civilization war I, and other so plenty of things.

You are here toknow valence electron of a chlorine atom, aren’t you? Don’t worry along with chlorinevalence electrons us will explain its valency also. But prior to that let’s havesome simple ideas about what these 2 terms are:

Difference BetweenValence Electrons and Valency

Valence electronsare the total number of electrons current in the outermost shell of an atom(i.e. In outermost orbital). The valence electrons for a neutral atom arealways definite, it cannot be differed (more or less) in any kind of condition because that aparticular atom and may or might not be equal to its valency.


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Valency is definedas the total variety of electrons one atom have the right to lose, gain, or share in ~ the timeof bond development to gain a stable electronic configuration i.e. To finish anoctet. The valency of one atom can be change in different compounds orchemical reactions due to the different bonding circumstances. Most of the timevalency varies/changes early out to adjust in oxidation and reduction states.

Chlorine (Cl)Valence Electrons

There room foursimple procedures to uncover out the valence electrons because that chlorine atom i m sorry are:

Step 1: discover theAtomic Number


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To discover out theatomic variety of chlorine, we have the right to use the routine table. With the assist of theperiodic table, we can conveniently see the the atomic variety of chlorine is 17. Asits atom number is 17, it has 17 protons, and also for neutral chlorine, thenumber of protons is always equal come the number of electrons i.e. Has actually 17electrons in that is nucleus.

Step 2: WriteElectron Configuration


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Electronconfiguration is the setup of electrons on the orbitals. The chlorineatom has actually a complete of 17 electrons so, we need to put 17 electrons in orbitals.The electrons will certainly be put in various orbitals according to the energylevel: <1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f>.Now,

Chlorine electronconfiguration Cl (17) =1s22s22p63s23p5(completeconfiguration).

= 3s²3p⁵(condensed configuration).

Step 3: DetermineValence Shell

As us know, thevalence shell of one atom deserve to be discovered from the highest number of principlequantum numbers which room expressed in the ax of n, and also in 3s²3p⁵, thehighest value of n is 3 so that the valence shell of chlorine is3s²3p⁵.

Step 4: FindValence Electrons

The complete number ofelectrons existing in the valence shell of one atom are dubbed valence electrons,and there space a total of seven electrons existing in the valence shell of chlorine(3s²3p⁵). Thus,chlorine has seven valence electrons.

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Valency that Chlorine(Cl)

There are manydifferent ways to discover out the valency of an atom which reflects the ability ofan atom to bond with various other atoms. Valence defines how conveniently an atom or afree radical can integrate with other chemical species. The valency of an atom isdetermined based on the variety of electrons lost, gained, or common withanother atom at the time of link formation.

An atom is claimed tobe stable once its outermost shells have actually eight electron (except H & He).If the total variety of electrons in outermost shells is in between one come four,the atom has actually positive valency and also if electron are in between four to eight, thevalency is calculate by individually from eight and also valency will be zero. Atomshaving four outermost electrons possess both confident and an adverse valency, andatoms having actually eight outermost electrons, valency will certainly be zero (i.e. Noblegases).

Elements choose chlorinecan reach the steady state (nearest inert gas configuration: Ar) by getting oneelectron.So the the valency of chlorine is 1.

Mathematically, theelectronic construction of chlorine is 2, 8, 7. And also as us know, if electronsin outermost shell exceed indigenous 4, it should be subtracted indigenous 8. So,

ElectronConfiguration that chlorine (Cl) = 2, 8, 7

We have the right to see the outermost shell of chlorine has actually 7 electron so, need to subtract it from 8.

8 – 7 = 1

That’s why valencyof chlorine is 1.

Note: In general, chlorinehas a stable oxidation state the -1 many of the time but it deserve to differ insome compounds v values 0 (Cl2), +1 (NaClO), +3 (NaClO2), +4 (ClO3), +5 (NaClO3),+7 (NaClO4). Do not confuse v -1 or something else (+1, +3, +4, etc.) with confident or an unfavorable signs, it is simply an oxidation number that can vary from compound to compound. However its valency is constantly 1 in any kind of case.

In an additional sense, achlorine atom can kind a preferably of one covalent link in a chemical bonding (Forexample: HCl, CCl4, CaCl2, etc.), and also that what valency is, the maximum abilityto form bonds through atoms at the moment of chemical bonding.

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We can also findthe valency of chlorine v the assist of the periodic table. As chlorinebelongs to group 17 (17A or VIIA) together with fluorine (F), bromine (Br), and also iodine(I), and astatine (At). These group aspects are additionally called halogens. All theseelements have valency one.