Amongst the following, select the element having highest ionisation enthalpy.
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a
Sodium
b
Potassium
c
Beryllium
d
Magnesium
answer is C.
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Detailed Solution
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 > Mg > Na > K.