As yo go down the group , the atomic radius gets bigger, due to an increase in extra electron shells
Ionisation energy
Group 2 atoms can lose up to 2+ electrons
Ionisation energy decreses as you go down group 2. This is becasue as you move down each element has an extra electron shell compared to the one above therefore extra inner shellls sheild outer electrons. Also elsctron are further away from nucleus hence reduces nucleus attraction. This makes it easier to remove electrons.
positive charge of the nucleus inceases as you go down the group but the effect is overridden by the extra shells
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