Compare ionic radio of Mg2+ and Li1+

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Solution

The values of ionic radii of Li+ = 0.74 A and Mg2+ = 0.72 A respectively. Thus, the lithium ion with +1 charge is only marginally larger than the magnesium ion having a charge of +2.

The Mg atom having a slightly larger size than Li. But the Mg2+ ion is marginally smaller in size than the Li+ ion because of its higher nuclear charge.

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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

N a^{+}

M g^{2 +}

A l^{3 +}

S i^{4 +}

N a^{+}

1.02 \circ A

i n \circ A

M g^{2 +}

A l^{3 +}

N a^{+}

M g^{2 +}

A l^{3 +}

L i^{+}

B e^{+}

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