Answer :
In general trend,
The size of the element increases as we go down in a same group.
And the electronegativity of the element decreases as we go down in a same group.
For example : The two elements Magnesium and Calcium in a same group number 2.
The size of calcium is greater than the magnesium because as we go down in a group the atomic radius increases and the size also increases. And the electronegativity of calcium is less than the magnesium because as we go down in a group the electronegativity decreases.