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when energy is added to an electron in the lowest energy state (the ground state) and it jumps to a vacant orbital of slightly higher energy in the atom
a substance that does not allow heat or energy transfer.
a halogen atom (F, Cl, Br or I) reacts by addition reaction with alkenes
a chemical reaction in which a solid product forms from aqueous (aq) reactants.
the average mass of all the different isotopes of an element.