the energy required to remove electrons is the definition of: atomic number atomic radius ionization…

the energy required to remove electrons is the definition of: atomic number atomic radius ionization electronegativity
Answer
Brief Explanations:
Ionization energy is the energy needed to remove electrons from an atom or ion. Atomic number is the number of protons, atomic radius is the size - related property, and electronegativity is the ability to attract electrons.
Answer:
C. Ionization