The following are isoelectronic ions except

Assessment: JAMB UTME - Chemistry - 2019 Subject: Chemistry

Question 1 Report

Na

^{+}

Mg

^{2 +}

Si

^{2 +}

O

^{2 +}

Answer Details

Two or more ions are said to be isoelectronic if they have the same electronic structure and the same number of valence electrons.
Na

^{+}

= 10 electrons = 2, 8
Mg

^{2 +}

= 10 electrons = 2,8
O

^{2 -}

= 10 electrons = 2,8
Si

^{2 +}

= 12 electrons = 2,8,2

⟹

Si

^{2 +}

is not isoelectronic with the rest.

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