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

Options

A. The electronic configuration of `Cr` is `[Ar](3d]^(5) (4s)^(1)`. `("Atomic number of" Cr=24)`
B. The magnetic quantum number may have negative values.
C. In silver atom, `23` electrons have a spin of one type and `24` of the opposite type. `("Atomic number of" Ag=47)`
D. None of these

Answer

A, B, C

Explanation

(A) `_(24)Cr :[Ar]3d^(5)4s^(1)` (B) `m=-l "to" +l` through zero .
(C) `_(47)Ag: 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(10)4p^(6)5s^(1)4d^(10`.
Since only one unpaired electron is present. `:. 23` electrons have spin of one type and `24` of the opposite type.