Question

1. in general, as you go across a period from left to right in the periodic table the atomic radius ____, the electron affinity __, and the first ionization energy ____. a. increases, decreases, increases b. increases, increases, decreases c. increases, increases, increases d. decreases, increases, increases e. decreases, increases, decreases

Explanation:

1. Atomic radius: Across a period (left - right), the number of protons increases, pulling electrons closer. So atomic radius decreases.
2. Electron affinity: As we move left - right, atoms have a greater tendency to gain electrons, so electron affinity increases.
3. First ionization energy: More protons hold electrons tighter, so energy needed to remove the first electron (first ionization energy) increases.

Matching these trends: atomic radius decreases, electron affinity increases, first ionization energy increases. This corresponds to option D.

Answer:

D. decreases, increases, increases