Question

 Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.

Answer 1

The electronic configurations are repeated because 2, 8, 18 and 32 are the maximum number of electrons that can be placed in the four atomic shells, namely, K, L, M and N. The properties of the elements are repeated after 2, 8, 18 and 32 because the electronic configurations of elements are repeated after 2, 8, 18 and 32.