Select the correct configurations among the following

Options

A. `Cr(Z = 24):[Ar]3d^5, 4s^1`
B. `Cu(Z = 29): [Ar]3d^(10),4s^1`
C. The energy of an electron in an atomic orbital of multi-elelctron atom depends on principal quantum number only
D. `Pt(Z =78):[Xe]4d^(10)4s^(2)`

Answer

A, B, C

Explanation

Pt(Z=78) , Valence E.C. `=5d^9 6s^1`