Among alkaline earth metals _______ is having the highest ionization energy. (a) Beryllium (b) magnesium (c) Calcium (d) Barium
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Beryllium is the smallest element in this group. Thus, it is very hard to remove an electron from it. Hence, it has the highest ionisation energy among all the alkaline earth metals.
Posted by
Ankit Dutt
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Berrylium due to it's smallest size among the given options.