Chemistry And Periodic Table By Carl Wilhelm Scheele

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One of the most famous element in periodic table is chlorine with atomic number 17 and with atomic weight of 35.453. It is located in the Halogens group in the periodic table right below the element fluorine.
The picture on the left is of Carl Wilhelm Scheele, He was Swedish chemist who discovered many elements in the history of science. He was one of those people who never took any credits in his favor. The element chlorine was discovered by him in 1774, when he reacted hydrochloric acid (HCL- a solution made up of hydrogen chloride) with manganese dioxide (MnO2). 4HCl + MnO2 - MnCl2 + 2H2O + Cl2
According to Jack challoner, in his book “The elements” he says, after the reaction has occur “Scheele noted that gas produced by the
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But Guess what, Chlorine has a very strong smell with yellow- green tinge to it.
There are some elements that cannot exist by themselves and chlorine is one of those type of element which cannot be stable by itself. In order to be stable this type of elements combines with atoms of same element. In simple words we can say that chlorine is a diatomic element meaning it cannot be by itself. Simply it cannot exists as Cl. Chlorine is reactive and that’s when it is isolated from everything but chlorine will combine into a diatomic (two atom of chlorine) molecule. Therefore sometimes chlorine will appear in form of gas.
Still not clear about what diatomic mean? Well, di mean 2 and atom is atom so it simply means two atoms of chlorine combines with each other. Look at the diagram below,


By looking at my above diagram it should have been clear that diatomic simply mean two atom of same element joint together that is a diatomic element. Therefore chlorine is often found as Cl2.
But there is something to more to it and that is chlorine is diatomic ONLY when it is found alone, whenever chlorine are chemically bonded to another atom they are NOT diatomic. In fact when chlorine are bonded to another atom other than itself, then the number of chlorine depends on charge of other atom. To make it simpler to understand I can say chlorine doesn’t like to stay alone, he always needs his brother to stay with him unless he

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