Question

The correct set of four quantum numbers for the electron in the outermost subshell of $Cu$ atom (atomic number 29) in its ground state, is

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

a

Answer 2

The electronic configuration of $Cu$ in ground state: $[Ar]3d^{10} 4s^{1}$ Hence, for outermost subshell, $n=4, l=0$ $m_{l}=0$ and $m_{s}=\frac{+1}{2}$.