On September 3, 1803, the English scientist John Dalton introduces the use of symbols to represent the atoms of different elements.

On a day like today (September 3) in 1803, the English scientist John Dalton introduced the use of symbols to represent the atoms of different elements.
John Dalton born 6 September 1766 and was an Englishman chemist, physicist and meteorologist. He is best known for introducing atomic theory to chemistry and for his research on colorblindness, named after him.
Dalton published his first table of relative atomic weights containing six elements (hydrogen, oxygen, nitrogen, carbon, sulfur and phosphorus) , relative to the weight of a hydrogen atom conventionally taken as 1.
Since these were just relative weights, they don't have a unit of weight attached.
Dalton provided no indication in this paper of how he arrived at these numbers, but in his lab notebook, dated September 6, 1803, has a list in which he established the relative weights of atoms of various elements, derived from analysis of water, ammonia, carbon dioxide , etc. by the chemists of the time.

Compounds were listed as binary, ternary, quaternary, etc. (molecules composed of two, three, four, etc. atoms) in the New System of Chemical Philosophy depending on the number of atoms a compound had in its simplest empirical form.

Dalton hypothesized that the structure of compounds can be represented in whole number ratios. So, an atom of element X combining with an atom of element Y is a binary compound. Furthermore, an atom of element X combining with two atoms of element Y, or vice versa, is a ternary compound. Many of the first compounds listed in the New System of Chemical Philosophy correspond to modern views, although many others do not.

Dalton used his own symbols to visually represent the atomic structure of compounds. They were represented in the New System of Philosophy Chemistry , where he listed 21 elements and 17 simple molecules.

As a curiosity, Dalton published articles on topics as diverse as rain and dew and the origin of springs (hydrosphere); about heat, the color of the sky, steam, and the reflection and refraction of light; and on the grammatical issues of auxiliary verbs and participles of the English language.

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- Mr. Dalton
- tell me
- has visitor
- who is it?
- Says he's Lucky Luke
- oops
-if
- another funny guy
-if
-y What does he want?
- says you are detained
- ok, give him a piece of candy and tell him I laughed a lot
- yes sir
- how heavy all of them
-if

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