Amongst the following, select the element having highest ionization enthalpy.

Sodium

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Potassium

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Beryllium

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Magnesium

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Solution

The correct option is C Beryllium
Ionisation enthalpy increases on moving from left to right in a period and decreases on moving down in a group. Thus, order of ionisation enthalpy is
$B e > M g > N a > K$ .

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