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Question: Answered & Verified by Expert
What happens in the excited state of a Be atom to account for its bivalency?
ChemistryChemical Bonding and Molecular StructureNEET
Options:
  • A One 2s-electron is promoted to the 2p orbital.
  • B One 2s-electron is promoted to the 3s orbital.
  • C One 2s-electron is promoted to the 2d orbital.
  • D The 2s-electron remains in the same orbital.
Solution:
2655 Upvotes Verified Answer
The correct answer is: One 2s-electron is promoted to the 2p orbital.
In the excited state of a Be atom, one of the 2s-electrons is promoted to a vacant 2p orbital to account for its bivalency.

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