Question

General electron filling of elements of period 6 follows the order
1) ns + (n - 2)f (n-1)d →np
2) ns np (n-1)d → (n-2)f
3) ns (n-1)d (1-2)f →np
4) ns → np → (n - 2)f → (n-1)d​

Answer 1

Electronic Configuration

Explanation:

• For period 6 elements the electronic configuration of some of the different elements are shown below,

1. Os = [Xe] $4f^{14} 5d^{6} 6s^{2}$
2. Ir = [Xe] $4f^{14} 5d^{7} 6s^{2}$

• By observing the trend, we can infer that the electron filling will follow the trend ns + (n - 2)f (n-1)d →np

• Also, there is an easy way to memorise the electron filling order, follow the figure shown below,