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Question: Answered & Verified by Expert
According to Aufbau's principle, which of the three $4 d, 5 p$ and $5 s_{\text {will be filled with electrons first }}$
ChemistryStructure of AtomJEE Main
Options:
  • A $4 d$
  • B $5 p$
  • C $5 \mathrm{~s}$
  • D $4 d$ and $5 s$ will be filled simultaneously
Solution:
1152 Upvotes Verified Answer
The correct answer is: $5 \mathrm{~s}$
According to the Auffau's principle, electron will be first enters in those orbital which have least energy.

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