Q. Find the incorrect trend for alkaline earth metals

A
Atomic size Be < Mg < Ca < Sr
B
Second ionization energy Be < Mg < Ca < Sr
C
Hydration enthalpy Sr < Ca < Mg < Be
D
Density Ca < Mg < Be < Sr
Solution:

Alkali metals acquire , noble gas configuration after losing 1 electron , therefore their second ionization energy is higher than alkaline earth metals .

Ionisation energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.

Ionization energy decreases down the group , due to increase the atomic size .

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