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S8P1.a
Term | Definition |
---|---|
Atom | The smallest unit of element that maintains properties of that element |
Element | A substance that cannot be separated or broken down in to simpler substances by chemical means |
nucleus | in physical science,an atoms central region,which is made up of protons and neutrons |
proton | a subatomic particle that has a positive charge and that is found in the nucleus of and atom |
neutron | a subatomic particle that has a negative charge |
atomic mass | a mass of an atom expressed in atomic mass iunits |
chemical symbol | a one- or two-letter code that represents an element |