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NEETChemistryChemical Bonding and Molecular Structure

What happens in the excited state of a Be atom to account for its bivalency?

Options

  1. AOne 2s-electron is promoted to the 2p orbital.
  2. BOne 2s-electron is promoted to the 3s orbital.
  3. COne 2s-electron is promoted to the 2d orbital.
  4. DThe 2s-electron remains in the same orbital.

Correct answer

A. One 2s-electron is promoted to the 2p orbital.

Step-by-step solution

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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