NEET2026ChemistryChapterActual
Identify the set of species that are isoelectronic with one another.
Options
- AO²⁻, F⁻, Na⁺, Mg⁺
- BP³⁻, S²⁻, Cl⁻, K
- CCl⁻, K⁺, Ca²⁺, Sc³⁺
- DN³⁻, C⁴⁻, O⁻, F⁻
Correct answer
C. Cl⁻, K⁺, Ca²⁺, Sc³⁺
Step-by-step solution
Isoelectronic species are those which have the same number of electrons. For the given options, the number of electrons in each species is calculated as follows: O²⁻ has 8 + 2 = 10 electrons, F⁻ has 9 + 1 = 10 electrons, Na⁺ has 11 - 1 = 10 electrons, Mg⁺ has 12 - 1 = 11 electrons. P³⁻ has 15 + 3 = 18 electrons, S²⁻ has 16 + 2 = 18 electrons, Cl⁻ has 17 + 1 = 18 electrons, K has 19 electrons. Cl⁻ has 17 + 1 = 18 electrons, K⁺ has 19 - 1 = 18 electrons, Ca²⁺ has 20 - 2 = 18 electrons, Sc³⁺ has 21 - 3 = 18 electrons.