Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The first ionsation enthalpies of the alkaline earth metals are higher than that of alkali metals but second ionisation enthalpies are smaller, why?
A
In alkali metals, second ionisation enthalpy involves removal of electron from noble gas electronic configuration while in alkaline earth metals, second electron is removed from 
configuration.
configuration.
B
Alkaline earth metals have very high melting point as compared to alkali metals.
C
Electrons in s – orbital are more closely packed in alkaline earth metals than alkali metals.
D
Due to smaller size alkaline earth metals do not form divalent ions very easily.
Text Solution
Verified by ExpertsThe correct answer is:
A
Alkaline earth metals –
Alkali metal
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