WordNet
atomic number 7
n. a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues [syn: nitrogen, N]
Usage examples of "atomic number 7".
Could there be an undiscovered chemical element between atomic number 6 (which is carbon) and atomic number 7 (which is nitrogen)?