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 greater metallic character.

(a) B or Al 

(b) Na or K 

(c) Mg or Ba 

(d) H or Fe.

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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