Atomic radius increases down a group in the periodic table due to the addition of electron shells. Atomic radius generally decreases across a period from left to right due to increasing effective nuclear charge pulling the valence electrons closer to the nucleus.
The correct order of atomic radius of Li, Na, Be and O is
Asked in UPSC CDS 1 2024 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
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