Molecules

thumb|Atomic force microscopy (AFM) image of a PTCDA molecule, in which the five six-carbon rings are visible thumb|A scanning tunneling microscopy image of [[pentacene molecules, which consist of linear chains of five carbon rings]] thumb|AFM image of 1,5,9-trioxo-13-azatriangulene and its chemical structure

thumb|200px|A representation of the structure of myoglobin, showing alpha helices, represented by ribbons. This protein was the first to have its structure solved by [[X-ray crystallography by Max Perutz and John Kendrew in 1958, for which they received a Nobel Prize in Chemistry]]

thumb|Leaves change color in the fall because their chromophores (chlorophyll molecules) break down and stop absorbing red and blue light.

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permanent geometry that results from the spatial arrangement of molecular bonds

aspect of history

molecular gases which transmit information within organisms, for example NO, CO, H2S, SO2

the total number of atoms present in one molecule of an element, compound or a substance is usually reffered to as atomicity.

molecule consisting of multiple chemical element; molecules composed of more than one type of element

space chemistry