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A state of matterAnything that occupies space and has mass; contrasted with energy. in which the atomic-scale particles remain close together but are able to change their positions so that the matter takes the shape of its container
A negatively charged, sub-atomic particle with charge of 1.602 x 10-19 coulombs and massA measure of the force required to impart unit acceleration to an object; mass is proportional to chemical amount, which represents the quantity of matter in an object. of9.109 x 1023 kilograms; electrons have both wave and particle properties; electrons occupy most of the volume of an atom but represent only a tiny fraction of an atom's mass.