Question

The set of quantum numbers for the outermost electron for copper in its ground state is ___________

• A. $3 , 2 , 2 , + 1/2$
• B. $4 , 1 , 1 , + 1/2$
• C. $4 , 2 , 2 , +1/2$
• D. $4 , 0 , 0 , +1/2$

Answer 1

Answer: (D)

$4 , 0 , 0 , +1/2$

Answer 2

The electronic configuration of the Cu atom is ${ }_{29} Cu =[ Ar ] 3 d^{10} 4 s^{1}$ Since, the outermost shell is $4 s$, thus outermost electron is in it. For $4 s^{1}$, $n=4,$ $l=0,$ $m=0,$ $s=+\frac{1}{2}$