Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas D'Acceso á Universidade) Exam

Which list arranges the isoelectronic species N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ in order of DECREASING ionic radius?

N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺ Mg²⁺ > Na⁺ > F⁻ > O²⁻ > N³⁻ F⁻ > O²⁻ > N³⁻ > Mg²⁺ > Na⁺ N³⁻ > F⁻ > O²⁻ > Na⁺ > Mg²⁺

Correct Answer:

N³⁻ > O²⁻ > F⁻ > Na⁺ > Mg²⁺

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