1. Which best explains why ionization energy tends to decrease from the top to the bottom of a group?
A. The number of orbitals decreases.
B. The number of neutrons decreases.
C. Electrons get closer to the nucleus.
D. Electrons get farther from the nucleus.
3. When electrons are removed from the outermost shell of a calcium atom, the atom becomes
A. an anion that has a larger radius than the atom.
B. an anion that has a smaller radius than the atom.
C. a cation that has a larger radius than the atom.
D. a cation that has a smaller radius than the atom.
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