Editing Structural formula (section)

=== Stereochemistry (Skeletal formula) ===
[[File:Strychnine.svg|thumb|200px|Skeletal formula of [[strychnine]]. A solid wedged bond seen for example at the nitrogen (N) at top indicates a bond pointing above-the-plane, while a dashed wedged bond seen for example at the hydrogen (H) at bottom indicates a below-the-plane bond.]] [[Chirality (chemistry)|Chirality]] in skeletal formulas is indicated by the [[Natta projection]] method. [[Stereochemistry]] is used to show the relative spatial arrangement of atoms in a molecule. Wedges are used to show this, and there are two types: dashed and filled. A filled wedge indicates that the atom is in the front of the molecule; it is pointing above the plane of the paper towards the front. A dashed wedge indicates that the atom is behind the molecule; it is pointing below the plane of the paper. When a straight, un-dashed line  is used, the atom is in the plane of the paper. This spatial arrangement provides an idea of the molecule in a 3-dimensional space and there are constraints as to how the spatial arrangements can be arranged.<ref name=":0" />