First slide

Atomic number, mass number, isotopes, isobars and isotones

Question

Which set represents isoelectronic species?

Easy

A

Na⁺ , Mg²⁺ Al³⁺, Cl^-
B

Na⁺ , Ca²⁺ , Sc³⁺, F^-
C

K⁺ , Cl^- , Mg²⁺ , Sc³⁺
D

K⁺ , Cl^- , Ca²⁺ , Sc³⁺

Solution

Species having same number of electrons and same electronic configuration are iso electronic species

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