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interaction of substances that lead to the formation of new substances
a covalent bond in which one pair of electrons is shared
atoms having the same numbers of protons but different numbers of neutrons
identifies a specific element; equals the number of protons in an atom of each element
substance made of two or more elements, one being carbon
occurs when atoms transfer electrons to other atoms
electrons in the outermost energy level; they are involved in bond formation
substance containing two or more elements chemically combined in a fixed ratio
shows the number and types of atoms in a molecule and how they are arranged
protons and neutrons together; make up the center of an atom