Consider the ions $L i^{+}, N a^{+}, B e^{2 +}, a n d M g^{2 +}$ . Which two are close to one another in size ?

L i^{+}

and

N a^{+}

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B e^{2 +}

and

M g^{2 +}

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B e^{2 +}

and

L i^{+}

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L i^{+}

and

M g^{2 +}

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Solution

The correct option is D $L i^{+}$ and $M g^{2 +}$
$L i^{+}$ and $M g^{2 +}$ have similar sizes ( $76$ pm and $72$ pm respectively). Similar sizes leads to similarity between lithium and magnesium which is known as diagonal relationship.

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The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+}, C a^{2 +}, M g^{2 +}, B e^{2 +}$

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Consider the ions Li+,Na+,Be2+,andMg2+. Which two are close to one another in size ?

The correct option is D Li+ and Mg2+Li+ and Mg2+ have similar sizes (76 pm and 72 pm respectively). Similar sizes leads to similarity between lithium and magnesium which is known as diagonal relationship.

Consider the ions $L i^{+}, N a^{+}, B e^{2 +}, a n d M g^{2 +}$ . Which two are close to one another in size ?

The correct option is D $L i^{+}$ and $M g^{2 +}$
$L i^{+}$ and $M g^{2 +}$ have similar sizes ( $76$ pm and $72$ pm respectively). Similar sizes leads to similarity between lithium and magnesium which is known as diagonal relationship.