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Chemistry · L3 · Why Atomic Radius Rises and Falls

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Atomic radius shrinks across a period as extra protons pull the same shell in tighter, and grows down a group as a whole new shell is added.

by @openstemUpdated Chemistry
Across a period, left to rightMore protons added to the same outer shellStronger pull on the outer electronsAtomic radius decreasesDown a group, top to bottomA whole new electron shell is addedOuter electrons sit farther out, shielded by inner shellsAtomic radius increases

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