How does atomic size vary in the modern periodic table?
Atomic size decreases from left to right in a period but increases from top to bottom in a group.
In the modern periodic table, atomic size decreases across a period from left to right because increasing nuclear charge pulls electrons closer.
Going down a group, atomic size increases because new electron shells are added, moving valence electrons farther from the nucleus.
Hence, Atomic size decreases from left to right in a period but increases from top to bottom in a group..
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