On the basis of their positions in the periodic table, select the atom with the

On the basis of their positions in the periodic table, select the atom with the larger atomic radius in each of the following pairs. Pick one answer for each section
(a) Na, Si:
Si 
Na
(b) Ba, Be:
Ba 
Be
(c) N, F:

F
(d) Br, Cl:
Br 
Cl
(e) Ne, Kr:
Kr 
Ne

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