According to general trends in the periodic table, predict which element in each of the following pairs

Question:

According to general trends in the periodic table, predict which element in each of the following pairs has the larger atomic radius.

(a) Rb or Sr

(b) As or Se 

(c) Pb or Bi 

(d) I or Xe.

Periodic Table:

2 3 4 10 6 3 7 11 Li 6.94 1 IA Na 22.99 19 37 5 Rb K 39.10 al 55 4 87 2 IIA Fr (223) Be 9.01 12 Mg 24.31 Sr

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