Definition: Inorganic substances are those that do not contain any elements other than carbon, hydrogen, or nitrogen (or their compounds). Examples include water, oxygen, calcium carbonate, and graphite. Inorganic materials can be either metallic or non-metalllic in nature. The term "inorganic" was originally used to describe minerals, which contained pure iron, aluminum, copper, and nickel. However, this classification is not applicable to organic substances.
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