Question

elements of first period contains valence electron in M shell N shell K shell L shell​

Answer 1

Answer:

electrons in first shell is k second is l, third I'd m

Answer 2

Answer:

Shells are given the symbols K, L, M and N

Shells in order from closest to furthest from nucleus:

K, L, M, N

Electron shells correspond to energy levels:

K is the 1st energy level (lowest energy level)

L is the 2nd energy level (higher energy than K shell)

M is the 3rd energy level (higher energy than L shell)

N is the 4th energy level (higher energy than M shell)

Electrons fill the lowest energy shells (energy levels) first.

K shell (1st energy level) can hold a maximum of 2 electrons.

L shell (2nd energy level) can hold a maximum of 8 electrons.

Electron configurations (electronic configurations) are written with number of electrons in lowest energy level (shell) first, separated by a comma from the number of electrons in the next energy level (shell), etc