Question #39125

1 Answer
Javaria Saleem
Jun 9, 2017

Because M shell has the capacity for 8 electrons. Secondly, 18
is used for all the sub shells in the M shell.

Explanation:

M shell has the capacity to store 8 electrons.
We have divided 18 in three sub shells of the shell M ,e.g.,
3s = 2
3p = 6
3d = 10
Now add them,
2+6+10 = 18
Electronic configuration of Ca =
1s^2, 2s^2,2p^6, 3s^2,3p^6, 4s^2, where;
K = 2
L = 8
M = 8
N = 2

You can take 18 as a whole but, if you'll take the M shell it contains 8 electrons, if we'll also count its sub shell electro configuration then it will be greater than 8.

Related questions
See all questions in Electron Configuration
Impact of this question
3530 views around the world
You can reuse this answer
Creative Commons License