: Paleoclimatology: chemical compound

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chemical compound

A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound. There are four types of compounds, depending on how the constituent atoms are held together:
* molecules held together by covalent bonds
* ionic compounds held together by ionic bonds
* intermetallic compounds held together by metallic bonds
* certain complexes held together by coordinate covalent bonds. A chemical formula specifies the number of atoms of each element in a compound molecule, using the standard abbreviations for the chemical elements and numerical subscripts. For example, a water molecule has formula H2O indicating two hydrogen atoms bonded to one oxygen atom. (Adapted from: https://en.wikipedia.org/wiki/Chemical_compound)

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