Which of the following is the correct order of decreasing atomic radius

$N a > L i > R b > C s$

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$C s > R b > N a > L i$

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$L i > N a > R b > C s$

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$R b > L i > C s > N a$

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Solution

The correct option is B
$C s > R b > N a > L i$

Down a group, electrons fill in additional shells and consequently atomic radius increases. So the correct order is $C s > R b > N a > L i$

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Similar questions

Which of the following is the correct decreasing order of atomic radius for following elements?
B, Al, Ga, In

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