WAEC Chemistry 2023 Objective — Question 24

Question 24 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

Isoelectronic species have the same number of

A. electronsCorrect
B. neutrons
C. protons
D. ions

Explanation

Isoelectronic species have the same number of electrons. For example, Ne, Na⁺, Mg²⁺, Al³⁺, F⁻, O²⁻ and N³⁻ each contain 10 electrons and are therefore isoelectronic.

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