Question

periodic table high school reference sheet
based on their definitions, electron affinity could be considered the opposite of
a. shielding effect.
b. ionization energy.
c. nonmetallic character.
d. effective nuclear charge.

Explanation:

Electron affinity is the energy change when an atom gains an electron. Ionization energy is the energy required to remove an electron from an atom. They are opposite processes (one is adding an electron, the other is removing an electron). Shielding effect is about inner electrons blocking nuclear charge. Non - metallic character is related to properties like electron - gaining tendency in a general sense (not directly opposite to electron affinity as a defined process). Effective nuclear charge is the net positive charge experienced by valence electrons.

Answer:

B. ionization energy