Chlorine, achemical facet with the prize Cl and atomic number 17, is really reactiveelement and strongest oxidizing agent as it has the greatest electron affinity andthird greatest electronegativity follow to the Pauli scale among theelements.

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One of the mostcommon link in the chemistry industry and also real-life intake constituentsodium chloride (NaCl) contains chlorine. The is supplied as sanitation, disinfection,antiseptics, weapons in human being war I, and also other so countless things.

You are here toknow valence electrons of a chlorine atom, aren’t you? Don’t worry together with chlorinevalence electrons us will explain its valency also. But before that let’s havesome straightforward ideas around what these 2 terms are:

Difference BetweenValence Electrons and also Valency

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


Valency is definedas the total number of electrons one atom can lose, gain, or share at the timeof bond formation to obtain a stable electronic configuration i.e. To complete anoctet. The valency of an atom have the right to be variable in various compounds orchemical reactions as result of the different bonding circumstances. Many of the timevalency varies/changes early out to readjust in oxidation and reduction states.

Chlorine (Cl)Valence Electrons

There are foursimple procedures to discover out the valence electrons because that chlorine atom i beg your pardon are:

Step 1: discover theAtomic Number


To discover out theatomic variety of chlorine, we can use the routine table. With the help of theperiodic table, we can quickly see that the atomic number of chlorine is 17. Asits atom number is 17, it has 17 protons, and for neutral chlorine, thenumber of proton is constantly equal to the variety of electrons i.e. Has 17electrons in that is nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the setup of electrons on the orbitals. The chlorineatom has actually a total of 17 electron so, we have to put 17 electron in orbitals.The electrons will be placed in different 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 have the right to be found from the highest number of principlequantum numbers which are expressed in the ax of n, and also in 3s²3p⁵, thehighest value of n is 3 so that the valence covering of chlorine is3s²3p⁵.

Step 4: FindValence Electrons

The full number ofelectrons current in the valence shell of one atom are dubbed valence electrons,and there space a complete of 7 electrons present in the valence covering of chlorine(3s²3p⁵). Thus,chlorine has actually seven valence electrons.

Also Read:

Valency of Chlorine(Cl)

There room manydifferent ways to uncover out the valency of an atom which reflects the ability ofan atom to bond with other atoms. Valence describes how quickly an atom or afree radical can incorporate with other chemical species. The valency of one atom isdetermined based upon the variety of electrons lost, gained, or common withanother atom at the time of link formation.

An atom is said tobe stable once its outermost shells have actually eight electron (except H & He).If the total number of electrons in outermost shells is in between one to four,the atom has positive valency and if electron are in between four come eight, thevalency is calculated by subtracting from eight and valency will certainly be zero. Atomshaving four outermost electrons own both hopeful and negative valency, andatoms having eight outermost electrons, valency will be zero (i.e. Noblegases).

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

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

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

We deserve to see the outermost covering of chlorine has 7 electron so, have to subtract the from 8.

8 – 7 = 1

That’s why valencyof chlorine is 1.

Note: In general, chlorinehas a steady 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). Carry out not confuse v -1 or something rather (+1, +3, +4, etc.) with confident or negative signs, that is just an oxidation number that can vary from compound to compound. Yet its valency is always 1 in any kind of case.

In another sense, achlorine atom can kind a preferably of one covalent shortcut in a chemistry bonding (Forexample: HCl, CCl4, CaCl2, etc.), and also that what valency is, the best abilityto form bonds with atoms at the moment of chemical bonding.

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We can likewise findthe valency the chlorine v the aid of the routine table. As chlorinebelongs to team 17 (17A or VIIA) together with fluorine (F), bromine (Br), and also iodine(I), and also astatine (At). These group facets are likewise called halogens. Every theseelements have valency one.