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Question: Atomic number of few elements are given below. Which of the pairs belons to s – block?...

Atomic number of few elements are given below. Which of the pairs belons to s – block?

A

7, 14

B

3, 20

C

8, 15

D

9, 17

Answer

3, 20

Explanation

Solution

: Z = 3; 1s22s11s^{2}2s^{1}

Z = 20; 1s22s22p63s23p64s21s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}