Talk:Ion

From the article:

The energy needed to remove electrons from an atom is called the ionization energy, and the equivalent electrical potential needed to impart that energy to an electron is known as the ionization potential.

Can someone please fact-check this?

Note: We need the exact Greek language etymology for anion and cation here.

I think anion is from the Greek 'ana' meaning "up" and cation from 'cata' ('kata') meaning "down". However someone should check this before putting it in the article.