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Expanded octets are possible from the third period onwards because:
A3d orbitals are available for bonding in addition to 3s and 3p
BThe atoms are larger and can hold more electrons
CThey form only ionic bonds
DElectronegativity drops sharply
Answer & Solution
Correct answer: A. 3d orbitals are available for bonding in addition to 3s and 3p
Beyond the second period, **vacant 3d orbitals** become energetically accessible and can participate in bonding — allowing more than 8 electrons around atoms like P (in PF₅) and S (in SF₆).
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