“Thus at the beginning of 1906 it seemed to be established that the emitters of the spectral series of chemical elements are their positive atomic ions.”
Other Johannes Stark Quotes
The most common and most important result of them is that the nature and size of the effect on corresponding series of different elements are largely an expression of the peculiarity of their atomic structure - or, at least, of the structure of the surface.
Johannes Stark 
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The question of the composition of perceptible objects is one which already occupied the mind of the ancient Greeks.
Johannes Stark
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The discovery of various phenomena has led to a recognition of the fact that the chemical atom is an individual which again is itself made up of several units into a selfcontained whole.
Johannes Stark
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