Question

How old you justify the presence of 18 elements in the 5th period of periodic table?

Answer 1

Hiii

.

.

Here, n = 5, l = 0, 1, 2, 3. The order in which the energy of the available orbitals 4d, 5s and 5p increases is 5s < 4d < 5p. The total number of orbitals available are 9. The maximum number of electrons that can be accommodated is 18; and therefore 18 elements are there in the 5th period.

.

.

Hope It Helps☺☺