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S8P1.a
Matter: 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 separated or broken down into similar substances by chemical means. |
nucleus | in physical science, an atom's central region which is made up of protons and neutrons. |
electron | a submatic particle that has no charge and that is found in the nucleus of an atom. |
proton | a submatic particle that has a positive charge and that is found in the nucleus of an atom |
neutron | a submatic particle that has no charge and is found in the nucleus of an atom. |
atomic number | the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of a number |
neutral | having no overall change |
atomic mass | the mass of an atom expressed in atomic mass untits |
chemical symbol | a one or two letter code that represents and element |