MCQ
Set of species in which $3^{rd}$ principal level is completely filled
  • A
    $Ar, Zn$
  • $Cu, Zn$
  • C
    $Cu^{+2}, Zn^{+2}$
  • D
    $Cl^-, Ar$

Answer

Correct option: B.
$Cu, Zn$
b

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