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Amongst the following select the element...

Amongst the following select the element havinghighest ionization enthalpy.

A

Sodium

B

Potassium

C

Beryllium

D

Magnesium

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The correct Answer is:
C
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
`Be gt Mg gt Na gt K`
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