a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
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Learn these words derived from the Greek root kata-, which has a range of meanings including "down," "through," "against" "across," "along with," and "wrongly."
If you want a solid grasp of the properties of matter, review this vocabulary list. You'll learn about the phases of matter, the structure of atoms, and the properties of different elements. It's mind over matter!