Question

How many electrons with l=2 are there in an atom having atomic number 54.

Answer 1

If l=2, n=3. And the orbital is d. And the electronic configuration is as follows

1s2 2s2 2p6 3s2 3p6 4s2 3d10…..

This there are 10 electrons with l=2 in an atom.

Answer 2

Answer: Answer is 20

Explanation:

When we say l =2 it means we are talking about d subshell.

S=0

P=1

D=2

F=3

Here the atomic number is 54 so the configuration is:

[Ar] 3p6 3d10 4s2

D= 10

Hence 10×2=20.

Hope it helps!