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a group of elements between the metals and the non-metals. They are semiconductors and have some metallic and some non-metallic properties.
the theory of acids and bases which defines an acid as a proton donor and a base as a hydroxide...
redox reactions can be described as two half-reactions (one oxidation, the other reduction).
the electrons in the filled, inner energy levels of an atom.
a law defining the relationship between pressure, volume, temperature and moles of a gas....
a very small, negatively charged particle that moves around the nucleus of an atom.