JEE MAIN - Chemistry (2004 - No. 58)

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

K⁺, Cl^-, Mg²⁺, Sc³⁺

Na⁺, Ca²⁺, Sc³⁺, F^-

K⁺, Ca²⁺, Sc³⁺, Cl^-

Na⁺, Mg²⁺, Al³⁺, Cl^-

Explanation

Isoelectronic means those species whose no of electrons are same.

Ions	Atomic No	No of Electron
K⁺	19	19-1=18
Ca⁺²	20	20-2=18
Sc⁺³	21	21-3=18
Cl^-	17	17+1=18

So, option $$(C)$$ is correct.

JEE MAIN - Chemistry (2004 - No. 58)

Explanation

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