The van der Waals' radius of $N a$ :

210

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214

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227

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223

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Solution

The correct option is C $227$ pm
The van der waal's radius is always greater than the covalent radius as the van der waals forces are weaker than the covalent forces.
The covalent radius is 157 pm and the increment between radii of different magnitudes is 60 pm. Hence, the van der waal's radius is $157 p m + 60 p m = 217 p m$

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