By recognizing that the chemical atom is composed of single separable electric quanta, humanity has taken a great step forward in the investigation of the natural world.
Johannes StarkThe question of the composition of perceptible objects is one which already occupied the mind of the ancient Greeks.
Johannes StarkThe emitters of the spectral series are without exception single atoms, not compounds of atoms.
Johannes StarkThe removal of an electron from the surface of an atom - that is, the ionization of the atom - means a fundamental structural change in its surface layer.
Johannes Stark