Which of the following statement(s) are correct?
1. Electronic configuration of Cr is `[Ar]3d^(5)4s^(1)` (At. No of Cr=24)
2. The magnetic quantum number may have negative value.
3. In silver atom, 23 electron have a spin of one type and 24 of the opposite type (At. No. of Ag=47)
4. The oxidation state of nitrogen in `HN_(3)` is -3.
A. 1,2,3
B. 2,3,4
C. 3,4
D. 1,2,4
