Question

The electonic Conguration of potassium (K) is 2 8 8 1 instead of 2 8 9 through the M shell can accomodate up to 18 electron Explain

Answer 1

But electron enters into the 4s shell after the completion of filling of 4s shell the electron enters into the 3d shell. So, the electronic configuration of potassium is 2 8 8 1. when electron enters into 4s shell means N shell and then it enters into 3d shell means M shell.

I hope that you understand