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CGP EDU Academic Team
Published on: August 14, 2026
Assertion: The first ionization energy of Be is greater than that of B.
Reason: 2p orbital is lower in energy than 2s.
Text Solution
Verified by ExpertsThe correct answer is:
C
Be has completely filled stable 2s 2 orbital and thus Be has higher ionisation energy than B. 2s orbital has less energy than 2p orbital. (From (n+ λ ) rule)
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