Question

electronic configuration of sodium, calcium and chlorine. at no 11,20 and 17​

Answer 1

Electronic configurations:-

1)Sodium (Na)

Atomic no:- 11.

Electronic configuration = ${1s}^{2} \: {2s}^{2} \: {2p}^{6} \: {3s}^{1}$

2) Calcium (Ca)

Atomic no:- 20.

Electronic configuration= ${1s}^{2} \: {2s}^{2} \: {2p}^{6} \: {3s}^{2} \: {3p}^{6} \: {4s}^{2}$

3) Chlorine (Cl)

Atomic no:- 17.

Electronic configuration = ${1s}^{2} \: {2s}^{2} \: {2p}^{6} \: {3s}^{2} \: {3p}^{5}$