The sepence of filling electgron in sub-shells of element with few exception in d-block and f-block element is govemed by.Aufhau principal followed by Hand's rule and palli's ecxcited principal
a. The electron prefers to unter into sub-shell with lower `(n +1)` values
The energy for any sub-shell of an element other than hydrogen is preportioanal to the sum of principal quantum number (n) and angular momentum quantum number
b. If `(n + 1)` value is same for many sub-shell with lowest n value
c. i. Fulfiling sub-shell is more stable
ii. Half filled sub-shell is more stable less than half filed
Which pair of element follow rulke (c ) (ii) ?

Options

A. `Cr,Mo`
B. `Mo,Fe`
C. Cu,Ag`
D. `N,P`

Answer

A

Explanation

Cr,Mo`