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CBSE Class 11-science Answered

Why first ionisation enthalpy of Mg is higher than Al

Asked by prashantyadav592 | 29 Jan, 2020, 09:39: AM
Expert Answer
Electronic configurations of Mg=1s2 2s22p3s2
Electronic configuration of Al=1s2 2s22p3s2 3p1
 
Mg has the first ionizaation enthalpy higher than that of Al due to fullfilled s orbital, it required high energy to remove electron from outermost shell.
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