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Cyclopropane (C₃H₆).

Cyclopropane is commonly represented by the structural formula

and cyclobutane (C₄H₈) by the structural formula

Note the triangle between the three carbon atoms for cyclopropane,
 and the square between the four carbon atoms for cyclobutane.

The single lines between the atoms
represent single covalent bonds.

Note that each carbon atom has four bonds (valency 4),
and each hydrogen atom has one bond (valency 1).
Valency is the combining power of an atom.

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