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the atom u3, l1&l2

atom is the smallest particle into which an element can be divided and still be the same element.
electron negatively charged particles.
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons.
proton positively charged particles in the nucles
neutron nucleus contains uncharged particles
electron cloud electrons move within an area around the nucleus.
atomic cloud number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in an atom's nucleus.
periodic table Mendeleev's arrangement of the elements
chemical symbol is an abbreviation for the element's name.
average atomic mass an atom is the weighted average of the mass of all the naturally occurring isotopes of that element.
metal are elements that are shiny and conduct heat and electricity well.
nonmetal are poor conductors of heat and electricity.
metalliod are elements that have some properties of metals and some properties of nonmetals.
group each vertical column of elements(from top to bottom) on the periodic table.
period each horizontal row of elements(from left to right) on the periodic table.
Created by: 18tgal0513