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s8p1.a
distinguish between atoms and molecules
Term | Definition |
---|---|
atom | the smallest unit of element that maintains the properties of that element atom |
element | substance that cannot be separated or broken down into simpler substances by chemical means element |
nucleus | in physical science, an atom's central region, which is made up of protons and neutrons nucleuos |
electron | a subatomic particle that has a negative charge electon |
atomic number | he number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element |
neutral | having no overall charge neutral |
atomic mass | the mass of an atom expressed in atomic mass units |
chemical symbol | a one- or two-letter code that represents an element chemicial symbol |
proton | a subatomic particle that has a positive charge and that is found in the nucleus of an atom proton |
neutron | a subatomic particle that has no charge and that is found in the nucleus of an atom neutron |