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ch.11 vocab
vocab
Term | Definition |
---|---|
atom | the smallest unit of an element that maintains the properties of that element |
electron | a subatomic particle that has a negative charge |
nucleus | in physical science, an atoms central region, which is made up of protons and neutrons |
electron cloud | a region around the nucleus of a atom where electrons are likely to be found |
proton | a subatomic particle that has a positive charge and that is found in the nucleus of a atom |
atomic mass unit | a unit of mass that describes the mass of an atom or molecule |
neutron | a subatomic particle that has no charge and that 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 |
isotopes | an atom that has the same number of protons as the other atoms of the same element does, but that has a different number of neutrons |
mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom |
atomic mass | the mass of an atom expressed in atomic mass units |