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An element in a Periodic Table has got a number known as atomic number. So to say the flat number (just as fun in saying) in which the particular element resides. Thus 1 is for hydrogen, 2 for helium, 3 for lithium and so. In 26, ferrous occupies. 79 is for gold and 80 is for Mercury. Uranium will be located at 92.

This atomic number is nothing but the number of protons in the nucleus of the atom (element).

O2 is not an element. It is a gas molecule which has two oxygen atoms. O is the element whose flat number in periodic table is 8.

CO2 is also a gas with the elements of carbon and oxygen. One atom of carbon and two atoms of oxygen.

So far elements with atomic number 108 have been found.

Diffraction of X-rays with crystals such an zinc sulphide has led to the right placement of the element in the periodic table.

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