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The ions of NaF and MgO have the same nu...

The ions of NaF and MgO have the same number of electrons and inter nuclear distances are about the same (235 pm and 215 pm). Why are then the melting points of NaF and MgO so different `(992^(@)C and 2642^(@)C)`?

Text Solution

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In ` Mg^(2+)O^(2-)` , both ions carry two units of charge whereas in ` Na^(+) F^(-)` , each ions carries only one unit charge. Hence, eelctrostatic forces of attraction in MgO are stronger.
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The ions of NaF and MgO all have the same number of electrons and internuclear distances are about the same (235 pm and 215 pm ). Why are then the melting points of NaF and MgO so different ( 992^@C and 2642^@C )?

Why the melting points of NaF and MgO (990^(@)C and 2640^(@)C ) are so different although both have same number of electrons and nearly the same internuclear distance (236 pm and 216 pm)?

Knowledge Check

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    A
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    B
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    C
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    D
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    B
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