#compounds

The emitters of the spectral series are without exception single atoms, not compounds of atoms. ↗

— Johannes Stark

#compounds #emitters #exception #series #single

In the first quarter of the nineteenth century the experimental proof for the interdependence of the composition and properties of chemical compounds resulted in the theory that they are mutually related, so that like composition governs like properties, and conversely. ↗

— Wilhelm Ostwald

#chemical #composition #compounds #conversely #experimental