Electron affinity homework 1F.11

[Lorena Zhang 4E]

The problem asks what element of each of the following pairs has the higher electron affinity: gallium or indium; beryllium or magnesium. The answer for both is equal. I don't quite understand how that works.

[Andonios Karas 4H]

For this question, the book is going off the electron affinities from the figure 1F.12 which shows the electron affinities of different elements. Electron affinity doesn't directly follow a trend in the periodic table except that energies are highest towards the right side of the periodic table.

[Kavya Juwadi 3C]

In addition to the general trend of electron affinity being higher on the right, electron affinity generally decreases down a group