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Among the elements from atomic number 1 ...

Among the elements from atomic number 1 to 36, the number of elements which have an unpaired electron in their S subshell is

A

4

B

7

C

6

D

9

Text Solution

Verified by Experts

The correct Answer is:
C
`""_(1)H=1s^(1),""_(3)Li=2s^(1),""_(11)Na=3s^(1),""_(19)K=[Ar]`
`4s^(1)""_(24)Cr=[Ar]3d^(5) 4s^(1)""_(29)Cu=[Ar]3d^(10)4s^(1)`
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