Which has more smaller radius
br- or cl -
br- or cl2-

Dear student

Cl- is smaller in size than Br-. The difference in the size can be taken as a result of the charge: radius ratio. In the case of Br-, the number of shells is more and since there are more number of shells, so the distance between the nucleus and the outer most orbital is more and thus more will be the radius. 
In the second case also you have mentioned the ions as Br-, but its comparison is being asked with Cl2-. Can you please specify whether it is a molecule having a unit negative charge or an atom having a di negative charge.


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