Which of the following ion has largest size?

F^{-}

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A l^{+ 3}

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C s^{+}

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O^{- 2}

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Solution

The correct option is C $C s^{+}$
Periodic variation of atomic radius:
Across a period: It decreases from left to right in a period as the nuclear charge increases.
In a group: It increases from top to bottom in a group as the number of shells increases.
$C s^{+}$ has the highest ionic radii as it is on the extreme right corner of the table. So it is highest in its period and highest in the group.

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Similar questions

N a^{+}, M g^{2 +}

A l^{3 +}, N a^{+}

N^{3 -}, O^{2 -}, F^{-}

A l^{3 +} < M g^{2 +} < N a^{+} < F^{-}

T e^{2 -} > I^{-} > C s^{+} > B a^{2 +}

F e^{3 +} < F e^{2 +} < F e^{4 +}

M g > A l > S i > P

M g

M g^{2 +}

A l^{3 +}

Arrange the following in increasing order of the atomic sizes and give reasons

Na⁺ , Mg²⁺ , Al³⁺ , F^- , O^2- , C^4-

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