The correct set of quantum numbers for the unpaired electron of $\mathrm{Cu}$ atom is :

• A

  $\mathrm{n}=3,l=2, \mathrm{m}=-2, \mathrm{s}=+1/2$
• B

  $\mathrm{n}=3,l=2, \mathrm{m}=+2, \mathrm{s}=-1/2$
• Correct answer
  C

  $\mathrm{n}=4,l=0, \mathrm{m}=0, \mathrm{s}=+1/2$
• D

  $\mathrm{n}=4,l=1, \mathrm{m}=+1, \mathrm{s}=+1/2$

Hence, the correct answer is option: 'C'.