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horizontal rows of elements in the periodic table that are arranged according to their atomic mass.
the use of a catalyst to bring about the cracking of mineral oils that boil at high temperatures...
the part of the Earth and its atmosphere in which life can exist.
the transfer of electrons from one atom to another atom to form positive and negative ions...
reactions that cause the surroundings to cool. Heat is taken in.
those properties that can change without changing the chemical nature of a substance.