Which ion has the lowest radius from the following ions

Na⁺

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Mg²⁺

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Al³⁺

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Si⁴⁺

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Solution

The correct option is D Si⁴⁺
All are the iso-electronic species but $S i^{4 +}$ has high positive charge so has lowest radius. Greater the $\frac{z}{e}$ value, smaller is the size of the ion.

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Similar questions

N a^{+}

M g^{2 +}

A l^{3 +}

S i^{4 +}

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

N a^{+}, M g^{2 +}, A l^{3 +}

S i^{4 +}

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

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

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

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