Question

how are electron affinities typically expressed? as positive numbers as zero as fractions as negative numbers what general trend exists for electron affinities across the periodic table? they increase randomly they become more positive from left to right they remain constant across periods they become more negative from left to right

Explanation:

Electron affinity is the energy change when an electron is added to a neutral atom in the gaseous state. It is typically exothermic, releasing energy, so is expressed as a negative number. Across the periodic - table, as the effective nuclear charge increases from left to right (while the shielding effect remains relatively constant within a period), atoms have a greater attraction for electrons, and electron affinity becomes more negative from left to right.

Answer:

1. D. As negative numbers
2. D. They become more negative from left to right