Daltonide

In chemistry , daltonides are compounds that are composed of elements in fixed proportions. The term is no longer very common, it goes back to the discovery of constant proportions by John Dalton . (The colloquial tendency to refer to such compounds as " stoichiometric " is imprecise, since stoichiometry is merely the teaching of the measurement of the molar ratios and says nothing about the result.) Most known compounds are daltonides.

Examples

Some examples of daltonids are:

• Salts, e.g. B. NaCl
• Molecules, e.g. B. H ₂ O

opposite

The opposite of Daltonides are Berthollides , in which the elements are not all present in constant proportions (e.g. mixed crystals , glasses , alloys , polymers , ceramics ). The commonality of the bertholliden substances is that they have variable compositions: z. B.

• Lithium graphite C ₆ Li _x (x = 0 to 1).
• Apatite Ca ₅ (PO ₄ ) ₃ X (X = F, Cl, OH)