Question

Elements a, b, c and d have the following electronic configurations:

• a: 1s², 2s², 2p⁶
• b: 1s², 2s², 2p⁶, 3s², 3p¹
• c: 1s², 2s², 2p⁶, 3s², 3p⁶
• d: 1s², 2s², 2p¹

Which elements among these will belong to the same group of the periodic table

Answer 1

The elements ‘a’ [Ne (Z = 10), 1s², 2s², 2p⁶] and ‘c’ [Ar (Z = 18), 1s², 2s², 2p⁶, 3s², 3p⁶] have the same valence electronic configuration and hence, belongs to the same group, i.e., group 18 of the periodic table.

Similarly, the elements ‘b’ [Al (Z = 13), 1s², 2s², 2p⁶, 3s², 3p¹] and ‘d’ [B (Z = 5), 1s², 2s², 2p¹] have the same valence electronic configuration and hence, belongs to the same group, i.e., group 13 of the periodic table.