Define the correct order of atomic radius.

N a > M g > L i > B e

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N a > L i > M g > B e

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K > R b > C a > S r

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R b > K > S r > C a

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Solution

The correct option is A $N a > M g > L i > B e$
In a period, from left to right, with the increase in the atomic number, the atomic radius decreases.
In a group, on moving from top to bottom, with the increase in atomic number, the atomic radius increases.
the correct order of atomic radius
$N a > M g > L i > B e$

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The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is:

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