Question

which is isoelectronic with cl negative?
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Answer 1

Answer: Some of its isoelectronic species are S2– ion (16 + 2 = 18 electrons), Cl– ion (17 + 1 = 18 electrons), K+ ion (19 – 1 = 18 electrons), and Ca2+ ion (20 – 2 = 18 electrons)....

Answer 2

The isoelectronic species which $Cl^-$ ion is Ar or $K^+$.

• The species which have the same number of electrons are called isoelectronic species.
• The total number of electrons in $Cl^-$ is 17+1=18.
• Hence Ar which has 18 electrons will be isoelectronic with $Cl^-$.
• Again if K removes its one electron then it will be converted to $K^+$ and it has 18 electrons and remains isoelectronic with $Cl^-$.