Draw the geometrical atomic structure representing the electronic configuration of atoms of elements of :

1. Period-2
   1. group 14 [IVA] — carbon [at no. 6]
   2. group 15 [VA] — nitrogen [at. no. 7]
   3. group 16 [VI A] — oxygen [at no. 8]
2. Period-3
   1. group 1[IA] — sodium [at no. 11]
   2. group 2[IIA] — magnesium [at. no. 12]
   3. group 17[VIIA]— chlorine [at. no. 17]
3. Period-4
   1. group 2[IIA] — calcium [at. no. 20].

Period-2

(i) Group 14 [IV A] — Carbon[at no. 6]

(ii) Group 15 [VA] — Nitrogen [at. no. 7]

(iii) Group 16 [VI A] — Oxygen [at no. 8]

Period-3

(i) Group 1[IA] — Sodium [at no. 11]

(ii) Group 2[IIA] — Magnesium [at. no. 12]

(iii) Group 17[VIIA] — Chlorine [at. no. 17]

Period-4

(i) group 2[IIA] — Calcium [at. no. 20].