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S8P1.a
S8P1.A
definition | term |
---|---|
atom | the smallest unit of an element |
element | a substance that cannot be separated |
nucleus | an atom's central region |
proton | a subatomic particle that has a positive charge |
neutron | a subatomic particle that has no charge |
electron | a subatomic particle that has negative charge |
atomic number | the number of protons in a nucleus of an atom |
neutral | having no overall charge |
atomic mass | the mass of an atom expressed in atomic mass unit |
chemical symbol | a one or two letter code that represents an element |