31Ga has slightly higher ionisation enthalpy than 13Al although i… - Vidyadip

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, 3^s2, 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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