The energy required to cause a gaseous atom or ion to release a electron is what?

Explanation:

The ionization energy is required to cause a gaseous atom or ion to release a electron.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i think that the answer is c