Question

First ionisation enthalpy of berrylium is lower than all second group elements.
Why?

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Answer 1

Answer:

The first ionization enthalpy of magnesium is lower than the first ionization enthalpy of Beryllium Be becuase Be,Mg,Ca belongs to one group ,so down the group ionization energy will decrease so The first ionization enthalpy of magnesium is lower than the first ionization enthalpy of Beryllium Be (Lithium sodium anyhow belongs to first group how ever they are having low ionization potentials than these Be,Mg,Ca)