Question

1
CHEMISTRY - X
ATOMIC STRUCTURE
5. Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum
numbers, l

= 1 and 2 are respectively :
(AIEEE2004) [ ]
a) 12 and 4
b) 12 and 5
c) 16 and 4
d) 16 and 5
5th orbitis (AIFFE 2006)​

Answer 1

Explanation:

The configuration of Cr is 1s

2

,2s

2

,2p

6

,3s

2

,3p

6

,4s

2

,3d

4

.

l=1 corresponds to p subshell. in the p subshell, there are 12 electrons. 2p

6

+3p

6

.

Similarly for l=2, there are 4 electrons. 3d

4

.