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Which of the following pair of atomic nu...

Which of the following pair of atomic numbers represents `s-`block element ?

A

`7,15`

B

`6,12`

C

`9,17`

D

`3,20`

Text Solution

Verified by Experts

The correct Answer is:
D
(Z=3), `1s^(2)2s^(1)`
`(Z=20) : 1s^(2)2s^(2)2p^(6)3p^(6)4s^(2)`.
Both of these element belong to s-block
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