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S8P1.a
Distinguish between atoms and molecules
Term | Definition |
---|---|
atom | the smallest unit of an element that maintains the properties of that element |
element | a substance that cannot be broken down or separated into simpler substances by chemical means |
nucleus | in physical science, an atom's central region, which is made of protons an neutrons |
proton | a subatomic particle that has positive charge and is found in the nucleus of an atom |
neutron | a subatomic particle that has no charge and is found in the nucleus of an atom |
electron | a subatomic particle that has negative charge |
atomic number | the numbers of protons in the nucleus of an atom |
neutral | having no overall charge |
atomic mass | the mass of an atom expressed in atomic mass units |
chemical symbol | a 1 or 2 letter code that represents an element |