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Atoms

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electrons negatively charged particles
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
neutrons uncharged particles
electron cloud the area around the nucleus
atomic number the number of protons in the nucleus
mass number the total number of protons and neutrons
periodic table Dmitri Mendeleev's arrangement of the elements
chemical symbol an abbreviation for the element's name
average atomic mass an atom's weighted average of the masses of all the naturally occurring isotopes of that element
metals elements that are shiny and conduct heat and electricity as well
nonmetals poor conductors of heat and electricity
metalloids elements that have some properties of metals and some properties of nonmetals
group the vertical columns on the periodic table
period the horizontal rows on the periodic table
Created by: 18rliu1008