Answer:
Explanation:
An Isoelectronic Series is a group of atoms/ions that have the same number of electrons.
Na^+ , Mg^2+, N^3-, F^-, O^2- (This series each have 10 electrons.)
Arrange them in order of increasing size (increasing order of ionic radius)
Mg^2+ < Na^+ < F^- < O^2- < N^3-
72 < 102 < 133 < 140 < 146
The arrangement of the isoelectric ions in order of increasing size is; Mg^2+ < Na^+ < F^- < O^2-< N^3-
Isoelectronic ions are ions that have the same number of electrons. First, we must find out which ions are isoelectronic and they are; Na^+, Mg^2+, O^2-, F^-, N^3-. All these ions have ten electrons so they are isoelectronic.
Having known the isoelectronic ions in the list, we can now arrange them in order of increasing size and we obtain; Mg^2+ < Na^+ < F^- < O^2-< N^3-
This decrease in size of the ions stems from increase in the size of the nuclear charge across the period.
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