1.

The atomic sizes are not significantly different for the series of elements

Answer»

BI, Na, K, Pb
Na, Mg,Al,Si
O,S,SC,Te
Cr,Mn,Fe,CO

Solution :The decrease in size of inner d-subshell due to added electrons and their shielding EFFECT on the outer most electrons from the nuclear charge almost compensate for `Cr, Mn, Fe` and Co.


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