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subatomic particle
one of three particles that make up atoms (protons, neutrons, electrons)
proton
positively charged subatomic particle located in the nucleus of atoms
electron
negatively charged subatomic particle that surrounds the nucleus of an atom
neutron
subatomic particle with no charge located in the nucleus of atoms
nucleus
positively charged center of an atom that contains protons and neutrons
atomic number (Z)
number of protons in the nucleus of an atom
mass number (A)
number of protons and neutrons in the nucleus of an atom
chemical symbol
one, two or three letter abbreviation used to represent an element
isotope
atoms that contain the same number of protons but different numbers of neutrons
molecular formula
gives the number and kind of atoms in a molecule of an element
structural formula
shows the atoms in a molecule and how they are connected
group
vertical column of the Periodic Table
period
horizontal row of the Periodic Table
ionic compound
compound composed of cations and ions (has no net charge)
molecular compound
compound composed of covlently bonded atoms
anion
negatively charged atom or molecule (contains more electrons that protons)
cation
positively charged atom or molecule (contains more protons than electrons)
ion
atom or molecule with a charge (number of protons is not equal to number of electrons)
binary compound
compound that contains two different elements
polyatomic ion
ion composed of of more that one atom
