Find the correct option related to the size of sodium (Na) and Aluminium (Al) atom.

Na >Al

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Na = Al

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Na < Al

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None of these

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Solution

The correct option is C Na >Al
Sodium and Aluminium belongs to the same period.So,atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.
Hence radius of Na>Al and option A is correct answer.

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$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

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