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Unit 3
Term | Definition |
---|---|
atom | smallest particle in which an element can be divided |
electron | negatively charged atoms |
nucleus | small dense center of an atom |
protons | positively charged atoms |
neutrons | neutrally charged atoms |
electron cloud | place where all electrons are stored |
atomic number | number of protons in the nucleus |
mass number | total numbers of protons and neutrons |
periodic table | arrangement of elements |
metals | elements that are shiny and conduct electricity |
nonmetals | poor conductors of electricity |
metalloids | semi conductors |
group | elements with similar properties |
period | row of elements |
chemical symbol | abbreviation of elements name |
average atomic mass | weighted average mass of element |