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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties2 Marks
Question
31Ga has slightly higher ionisation enthalpy than 13Al although it occupies lower position in the group?
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Answer

Electronic configuration of 13Al = 1s2, 2s2, 2p6, 3s2, 3p1 Electronic configuration of 31Ga = 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2, 4p1
In Ga, 10 electrons present in 3d-subshell do not shield the outer electrons from the nucleus effectively. As a result, effective nuclear charge in Ga increases. That's why ionisation enthalpy of Ga is slightly more than that of 13Al.

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