Which of the following statement (s) is (are) correct?

Options

A. The electronic configuration of Cr is `[Ar] 3d^(5), 4s^(1)` (Atomic No. of Cr=24)
B. The magnetic quantum number may have a negative value
C. In silver atom 23 electrons have spin of one type and 24 of the opposite type (Atomic No. of Ag=47)
D. The oxidation state of nitrogen in `HN_(3)` is -3

Answer

A, B, C

Explanation

Only D is wrong because oxidation state of N in `HN_(3)` is -1/3.
Hence A,b and c are the correct aswer.