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Which pair of atomic numbers represents ...

Which pair of atomic numbers represents s-block elements ?

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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