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Which pair of atomic numbers represent s...

Which pair of atomic numbers represent s-block elements?

A

7, 15

B

6, 12

C

9, 17

D

3, 12

Text Solution

Verified by Experts

The correct Answer is:
D
`(3) rArr 1s^2 2s^1`
`(12) rArr 1s^2 2s^2 2p^6 3s^2`
Last `e^(-)` enters the s- sub shell of valence shell.
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