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CGP EDU Academic Team
Published on: August 13, 2026
Assertion: The ionisation energy of gallium is more than that of aluminium.
Reason: This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.
Text Solution
Verified by ExpertsThe correct answer is:
A
In Ga,10-d electrons in penultimate shell shield the nucleus charge less effectively, the outer electrons is held firmly by the nucleus. As a result, the ionisation energy remains nearly same as that of aluminium in spite of the fact that atomic size increases
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