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The ratio of the 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. of a sample of a material to its volume.
One of two or more compounds having the same chemical composition but differing in the arrangement of the atomsThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. (usually carbon atoms) forming the backbone of the structure of the compounds; also known as chain isomerOne of two or more substances that have the same molecular formula (are composed of elements in the same proportion and have the same molar mass), but differ in some aspect of structure..