×ish×212
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Explain why a fluoride ion is bigger than a sodium ion?
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t0897
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(Original post by ×ish×212)
Explain why a fluoride ion is bigger than a sodium ion?
F- ion and Na+ ion have the same number of electrons but by sodium losing an electron, it makes the attraction between the nucleus and outer electrons stronger (nuclear charge inc) and the atomic radius decreases, so Na+ is smaller. Fluorine gains an electron, and whilst the nuclear charge stays the same, the attraction weakens and atomic radius increases, making it bigger.
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