CBSE Class 11-science Answered
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Mg2+ ion is smaller in size than o2- ion although both have same electronic structure.
Asked by Ibrahim Mohammed | 22 Feb, 2015, 01:04: AM
Expert Answer
Oxygen and magnesium are isoelectronic species i.e. they have same number of electrons but differ in the magnitude of their nuclear charge.
Mg+2 ion has 12 protons in its nucleus and therefore exert higher effective nuclear charge compared to O2- which has 8 protons.
As a result, the inner shells and the valence shell electrons are more strongly attracted by the nucleus in Mg+2.
Therefore Mg+2 ion is smaller in size than O2- ion although both have same electronic structure.
Answered by Arvind Diwale | 22 Feb, 2015, 03:25: PM
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