MCQ
Beryllium’s fourth electron will have the four quantum numbers :
  • A
    $n=1,l=0,m=0,s=+1/2$
  • B
    $n=1,l=1,m=1,s=+1/2$
  • $n=2,l=0,m=0,s=-1/2$
  • D
    $n=2,l=1,m=0,s=+1/2$

Answer

Correct option: C.
$n=2,l=0,m=0,s=-1/2$
c

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