Question

The number of electron in Na having n+l=3
a- 4
b- 6
c- 7
d- 8

Answer 1

Answer:

Ans is 'b' i.e 6

Explanation:

N+l=3. (as given)

'Na' atom have only 2 orbital i.e s(l=0) and p(l=1) so n+l=3 is possible only for 2p orbital(according to Na atom)

By configuration

1s*2 2s*2 2p*6 3s*1

As we can see in 2p orbital no. Of electron is 6.