Cl minus ion is bigger than cl atom??

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Solution

When it is in Chlorine form has a atomic radius of 79pm, within the atom the the attractive forces between the protons in Chlorine and electrons are balanced. But now on addition of one extra electron, this is equilibrium disturbed or the repulsive force exceeds the attractive force. So the ionic radius of the Chloride ion increases to accommodate that repulsive forces between electrons.

To become stable, the radius of outer electron expands and ionic radius turns out to be 184 pm ( I guess), this is huge. Repulsion between the electrons should also be considered, not just the force present between the proton and electron.

Same goes for Cl(+) ions, so size is like this

Cl(+)< Cl < Cl(-) ion

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