Question

Find the order of energy level of 4th sub-she for following atoms? 

(1) H-atom 

(2) Br-atom

Answer 1

Properities	CU	CU+	CU2+	CU3+
Total number of electrons	29	28	27	26
Total number of s -electrons	7	6	6	6
Total number of p-electrons	12	12	12	12
Total number of d-electrons	10	10	9	8
Number of unpaired electrons	1	0	1	2
Total spin =+1/2 unpaired electrons	+1/2	0	+1/2	+1
Paramagnetic or diamagnetic character	P	D	P	P

Cu⁺ ion will be most stable because of fullyfilled d-orbital.