Which element has the most negative electron affinity K Ga P Sn?

Among the elements listed—K (potassium), Ga (gallium), P (phosphorus), and Sn (tin)—phosphorus (P) has the most negative electron affinity. This means that phosphorus releases more energy when gaining an electron compared to the other elements. Generally, nonmetals like phosphorus tend to have higher (more negative) electron affinities than metals, such as potassium and tin.