Question

a(4) ,b(9) c(19) e(20) which among the following belong means element belong to same ggroup​

Answer 1

Answer:

(c) Elements A (4) and B (9) belong to the second period, and elements D (19) and E (20) belong to the fourth period of the periodic table. Since the effective nuclear charge which pulls the outermost electron closer to the nucleus increases from left to right in a period, the atomic radii of the elements decreases.

Explanation:

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Answer 2

Answer:

Pls mark me as the brainliest if this is helpful

Explanation:

I think e 20group but exactly don't know