The examples of UCM structures and structure fragments without coordinates in 3-dimensional space.
The structure of dihydrogen cation.
The structure of heavy water.
This is an approximation of ozone structure by the resonance hybrid of classical Lewis structures E1-S-3-1 and E1-S-3-2. In another recently proposed structure for ozone classical Lewis structures E1-S-3-1 and E1-S-3-2 contribute 82% and the biradical structure E1-S-3-3 contributes 18% to the resulting resonance hybrid.
The 3-center-2-electron bond between the node elements that represent all oxygen atoms.
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This incomplete structure shows ionic bond in sodium chloride.
This incomplete structure shows hydrogen bond in hydrogen fluoride.