```

H H H H

| | | |

H - C - C - C - C - H

| | | |

H H H H

```

Explanation:

* Butane has four carbon atoms (C) in a straight chain.

* Each carbon atom is bonded to four other atoms (hydrogen).

* The structural formula shows the arrangement of atoms and bonds in the molecule.

Another way to represent it is:

CH₃-CH₂-CH₂-CH₃

Note:

* There is also an isomer of butane called *isobutane* which has a branched structure.

* Butane is a flammable gas commonly used as a fuel.