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Same Element: Cation vs Atom vs Anion (Removing electrons shrinks the species; adding electrons expands it: for the same element)

jee-mainjee-advancedneet-ug

Removing electrons shrinks the species; adding electrons expands it — for the same element

When to use this

Gas-phase trend reasoning; in crystals packing changes sizes — JEE usually wants the electron-count / proton-pull argument.