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horizontal rows of elements in the periodic table that are arranged according to their atomic mass.
a clear glassy material possessing good heat and electrical insulating properties.
a mixture that consists of visibly different substances or phases.
there are not enough electrons to contribute to an ordinary covalent bond.
the overall change in energy in a reaction, represented by âH. The difference in enthalpy of...
a state in which the outer energy level of an atom of any element is completely filled with...