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Atoms and Molecules
Term | Definition |
---|---|
Atom | the smallest unit of an elements that maintains the properties of that element |
Element | a substance that cannot be separated or broken down into simpler substances by chemical means |
Nucleus | in physical science, an atom's central region, which is made up of protons and neutrons |
Protons | A subatomic particle that has a positive charge and that is found in the nucleus of a atom |
Electron | a subatomic particle that has a negative charge |
Atomic mass | the mass of an atom expressed in atomic mass units |
chemical symbol | a one-or two-letter code that represents an element |
neutron | a substance particle that has no charge and that is found in the nucleus of an atom |
atomic number | the number of protons in the nucleus of an atom |
neutral | having no overall charge |