Chlorine is an element of atomic number 17. It is a mixture of two isotopes having a mass number of 35 and 37.
Write down the electronic configuration of the chlorine atom.

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Solution

The electronic configuration of an element describes how electrons are distributed in its atomic orbitals.
It is given on the basis of the number of electrons present in an atom.
The electrons are filled in the increasing number of shells viz. K,L,M,N,etc
Electronic configuration of chlorine atom-
Chlorine(Cl) has atomic number 17.
In a neutral chlorine atom there are 17 electrons and 17 protons.
Number of electrons in a shell is given by 2n² where n is the number of shell.
Putting n=1,2,3 and 4, we get the number of electrons 2,8,18,32 that can be filled in each shell respectively.
For chlorine, the electronic configuration is 2,8,7.

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