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atom the smallest particle of an element that still retains the properties of the element.
atomic number number of protons in an atoms nucleus.
average atomic mass weighted-average mass of the mixture of an elements isotopes.
electron particle surrounding the center of an atom that has a charge of 1-.
electron cloud the system of electrons that surround the nucleus of an atom.
electron dot diagram the method of writing a chemical symbol for an element that surrounds it with dots.
group 2 atoms put together that act as a unit.
isotope two forms of the exact element that have equal number of protons.
mass number the sum of all protons an all neutrons in a nucleus.
neutron a particle that is subatomic that has he same mass of a proton but does not have an electrical charge.
nucleus the most absolutely important part of an object, etc.
period the given name for a horizontal row on the periodic table.
periodic table chemical elements in order of atomic number and in rows.
proton a subatomic particle that is positively charged.
quark not directly observed subatomic particles that carry a electrical charge.
Created by: ncarey9