COMEDK2014ChemistryStructure of Atom
In the following sets of ions, which one is not isoelectronic with the rest of the species? O ²⁻, F ⁻, Na , Mg ²⁺, Al ³⁺, Ne
Options
- AMg ²⁺
- BAl ³⁺
- CO ²⁻
- DNa
Correct answer
D. Na
Step-by-step solution
O ²⁻ (10 e⁻ ), F ⁻ (10 e⁻ ), Na (11 e⁻ ), Mg ²⁺ (10 e⁻ ) Al ³⁺ (10 e⁻ ) and Ne (10 e⁻ ) Thus, Na is not isoelectronic with the rest of the species.