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the central core of an atom


a particle in the nucleus of an atom that has a positive charge


a particle in the nucleus of an atom that has no charge


a particle in the nucleus of an atom that has negative charge


a substance that is made of only one particular type of atom and cannot be broken down into simpler substances

chemical symbol

one or two letters that represent an elemen's name

periodic table

a chart that arranges all the known elements by their properties


two or more atoms joined together


a molecule that consists of two or more diffrent elements

chemical formula

a group of chemical symbols and numbers that describes the types and numbers of elements present in a molecule


the measure of how compact matter is

chemical reaction

the rearrangement of atoms within molecules with diffrent properties


a substance present at the start of a chemical reaction


a substance produced by a chemical reaction


the application of knowledge to accomplish a goal

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