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Atoms
Term | Definition |
---|---|
Matter | anything that has mass and takes up space (volume) |
Atoms | the basic building blocks of matter; smallest particle of an element |
Proton | a positively charged particle found in the nucleus of the atom |
Neutron | a particle with no charge, found in the nucleus of the atom |
Electron | a negatively charged subatomic particle that is located outside the nucleus of an atom |
nucleus | the center of the atom, contains protons and neutrons |
atomic number | the number of protons in the nucleus of the atom |
atomic mass | a measure of an atom's mass |
chemical symbol | a code, usually made up of one or two letters, used to represent an element |
compound | a pure substance that forms when two or more elements join chemically in a fixed proportion |
chemical formula | a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule |
subscript | a number that tells how man atoms of each element are in a molecule |