Which one of the following statement (s)...

Which one of the following statement (s) is (are) correct ?
(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 has a spin of one type and 24 of the opposite type. (Atomic No. of Ag = 47)
(D) The oxidation state of nitrogen in `NH_(3)` is -3 .

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