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)

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 $4 s^{1}$,

$n=4,$

$l=0,$

$m=0,$

$s=+\frac{1}{2}$