Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a bluegray metallic luster, it is a tetravalent metalloid.
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An inorganic compound is a chemical compound that is not an organic compound. There is no clear or universally agreedupon distinction between organic and inorganic ...
The natural environment encompasses all living and nonliving things occurring naturally. The term is most often applied to the Earth or some part of Earth.
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