Final answer:
Atomic radius refers to the size of an atom. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The attraction between an electron and a proton decreases as their distance increases. Ionization energy is the energy required to remove electrons from an atom or ion.
Step-by-step explanation:
A) Atomic radius: The atomic radius refers to the size of an atom. It is measured as the distance from the nucleus to the outermost electron shell. Atomic radius generally increases as you move down a group in the periodic table and decreases as you move from left to right across a period.
B) Charges of protons, neutrons, and electrons: Protons have a positive charge (+1), neutrons have no charge (0), and electrons have a negative charge (-1). Protons and electrons are attracted to each other because opposite charges attract.
C) Attraction between electron and proton: As the distance between an electron and a proton increases, they would feel less attraction to each other. The force of attraction between charged particles decreases with increasing distance.
D) Ionization energy: Ionization energy is the amount of energy required to remove electrons from an atom or ion. It is a measure of how strongly an atom holds its electrons. Higher ionization energy means it is more difficult to remove an electron.