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Consider the section of the periodic table:

Group number IA IIA IIIA IVA

Period 1 2 13 14

Second Li C

Third A Mg Al Si

Fourth K B D


Identify A, B, C and D.

A B C D

(a) Cs Be Ca C

(b) Na Ca B Ge

(c) Na B Ca Ge

(d) Cs B Ca C



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