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unit 3
Question | Answer |
---|---|
atom | the smallest particle into which an element can be divided and still be the same element |
nucleus | a small, dense center that has a positive charge and is surrounded by moving electrons |
protons | positively charged particles in the neclues |
neutron | contains an uncharged particles |
electron cloud | electrons move within an area around the neucles |
mass number | the total number of protons and neutrons in an atoms neucles |
atomic number | the number of protons in the neucles of an atom |
periodic table | arrangement of elements |
metals | elements that are shiny and conduct heat and electricity |
nonmetals | poor conductors of heat and electriciyt |
metaloids | elements that have some properties of metals and some properties of nonmetals |
group | vertical column of elements on an periodic table |
period | each horizontal row of the periodic table |
chemical symbol | abbreviation for the elements name |
average atomic mass | an atom is the weighted average of the masses of all the naturally occurring isotopes of stas |
electron | negatively charged particles |