Question

compare the atomic sizes of chlorine atom and chloride ion​

Answer 1

Explanation:

The only difference between an atom and its ions is the number of electrons that surround the nucleus. Example: A neutral chlorine atom contains 17 electrons, while a Cl- ion contains 18 electrons. ... For the same reason, positive ions should be smaller than the atoms from which they are formed.

Answer 2

Solution is given below.

To compare The atomic size of $Cl$ and $Cl^-$ ion .

We have to know , after gain of electron the inter electronic repulsion between every electrons increases , which cause the increase in separation between electrons and effectively increase the atomic size of ion .

Same thing happen with $Cl$ atom gain an electron and total number of electron in the outermost shell increases and atomic size increase due to the repulsion of electrons .

Learn More :

Periodic table

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