1.

Atomic numbers of few elements are given below which of the pairs belongs to s-block?A. 7,4B. 3,20C. 8,15D. 9,17

Answer» Correct Answer - B
Z=3,`1s^(2)2s^(1)`,Z=20,`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)`


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