A group of ions are given below. Find one pair which is not Isoelectronic. Na+, Al3+, Ca2+ , Br –, F –

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Solution

Ca atom has equal number of protons and electrons, and this number is 20. The Ca2+ ion has 2 electrons less. So, it has 18 electrons
The Br− ion has 36 electrons
So pair is Ca2+ andBr-
.Other ions have 10 electrons and they are isoelectronic

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