Question

find the electron distribution of atomic number 20 and reason for valency ​

Answer 1

Answer:

Atomic number 20 is of Calcium -

Electronic configuration – 1s2 2s2 2p6 3s2 3p6 4s2.

Valency – Valency of calcium is +2

Answer 2

Answer:

The element is Calcium.

K,L,M,N

2,8,8,2

Valency = 2

Valence electrons (e‐ in last shell) = +2