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Atomic radius of elements in a period de...

Atomic radius of elements in a period decrease with increase in atomic number but for inert gases it increases. Why?

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Atoms in the inert gases are held together by weak van der waals forces, not by covalent bonds. Thus, atomic radii and van der waals radii of inert gases are equal. However, an van der waals radius is greater than covalent radius, atomic radius of elements across a period decrease with increase in atomic number but for inert gases it increases.
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