The periodic table

The Periodic T up to(p)a)i)name of the element: oxygenii) Symbol: Oiii) nuclear number: 8iv) press number: 15.9994 amuv) Number of neutrons: 8vi) Electron contour:vii) Appearance:viii) run commove: -218.4°C boiling point: -183.0°Cix) Density: 1.429g/cm³x) Valencies:2xi) Uses of the element: without oxygen, in that location would be no sprightliness on this earth because oxygen is one of the necessities for life on this planet. xii) draft outline of its disco truly: it was observe in 1774 by Joseph Priestly. It was obtained from pellucid air. The name comes from the Greek lecture ?oxus? which means acid, and ?gennen? which means generate. b) concisely outline the development of the effortless table focusing on the contributions made by Mendeleev. The nightly table is a very important source of bringing up for many around the beingness for it is the organisation of all of the know elements. The table is very profitable because it is roaring to read info from once you are able to recollect how it is arranged. Long ago, there was no need for the periodic table for they did not understand the world around them. though when phosphorus was discovered by Hennig Brand, from preparing it from urine, an immense amount of information about compounds and elements were discovered during the meter after that.

When more(prenominal) and more elements and compounds were being discovered, scientists found the need to drudgery that information of easy access and use for future use. To attire the information they had pile up they found kinds which was found passim their discoveries as a nates to arrange them . Johann Dobereiner was a German chemist who! was one of the freshman to make an attempt to direct the elements. He attempted to organise them by looking at both physical and chemic properties. In 1817 Johann Dobreniner was able to find a remarkable pattern that... If you want to get a full essay, order it on our website: BestEssayCheap.com

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