Which of the following statement are correct ?

Options

A. The electronic configuration of Cr is `[Ar]3d^(5)4s^(1)`(atomic number of Cr is `24)`
B. The magnetic quantum number may have a negative value
C. In silver atom `23` electron have spin of one type and `24` of the opposite type (atomic number of `Ag is 47)`
D. The oxidation state of nitrogen in `HN_(3)` is `-3`

Answer

A, B, C

Explanation

`Cr(Z = 24)`
`[Ar]3d^(6)4s^(1)`
This is because `d^(5)` is a more half -filled configuration Reason for the stablity of half-filled and fallty filled ortained are symmetry and excharge energy
For every value of l m can be fromn -l to + l through 0, `Ag(z = 47)`
The oxidation state of N in `HN_(3)` is not `- 3`but `- 1//3`