As you move down through a group, electron affinity:?

Question

1.Increases
2. increases then decreases
3. Decreases
4. Remains constant

Answer 1

It will decrease.

Realize that as you move down a group, the atom gets larger and the nucleus (positive charges) is further away from the edge of the atom. So it is harder to attract new electrons

Answer 2

3. Decreases

Electronegativity increases as you go up and to the right of the periodic table, making flourine the most electronegative atom. Therefore flourine pulls A LOT of electron density towards itself. So by moving down a group you are decreasing electronegativity and decreasing the affinity it has for electrons.