atoms - The basic particle from which all elements are made, matter - Anything that has mass and takes up space., elements - A substance that contains one kind of atom and cannot be broken down into a simpler form., molecules - A neutral group of two or more atoms held together by a covalent bond., compounds - A substance made of two or more elements chemically bound in a specific ratio or proportion., mixture - Two or more substances that are together in the same place but their atoms are not chemically bonded., physical properties - A characteristic of a pure substance that can be observed without changing into another substance., chemical properties - A characteristic of a substance that describes its ability to change into different substances., substance - A single kind of matter that is pure and has a specific set of properties., protons - positive charge; found in the nucleus, neutrons - no charge, found in nucleus, electrons - negative charge; found in the cloud or shell,

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