EntityQ3454218· pop 5· linked from 2 articlesNitrogen ruleSign in to saveprinciple in mass spectrometryConnectionsparityEntityatomEntityhydrogenEntityoxygenEntitycarbonEntitynitrogenEntitychemical elementEntitysulfurEntitymoleculeEntitysiliconEntityphosphorusEntityInternational Standard Book NumberEntityorganic chemistryEntityintegerEntityionEntityhalogensEntitycovalent bondEntityorganic compoundEntityvalenceEntityamineEntityCategoriesMass spectrometryNitrogenNuclear chemistryParity (mathematics)