MCQ
When $3d$ orbital is complete, the new electron will enter the
  • $4p$-orbital
  • B
    $4f$-orbital
  • C
    $4s$-orbital
  • D
    $4d$-orbital

Answer

Correct option: A.
$4p$-orbital
a
(a) According to the Aufbau’s principle the new electron will enter in those orbital which have least energy. So here $4p$- orbital has least energy then the others.

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