The Periodic T up to(p)a)i)name of the piece: oxygenii) Symbol: Oiii) nuclear compute: 8iv) press number: 15.9994 amuv) Number of neutrons: 8vi) Electron form:vii) Appearance:viii) run channel: -218.4°C boiling apex: -183.0°Cix) Density: 1.429g/cm³x) Valencies:2xi) Uses of the element: without oxygen, in that location would be no conduct on this state because oxygen is one of the necessities for life on this planet. xii) draft precis of its disco truly: it was keep an eye on in 1774 by Joseph Priestly. It was obtained from gauze-like air. The name comes from the Greek linguistic process ?oxus? which means acid, and ?gennen? which means generate. b) short outline the development of the day-by-day t able focusing on the contributions made by Mendeleev. The biweeklyal table is a real important source of carriage for many around the universe for it is the organisation of all of the cognise elements. The table is very advantageous because it is roaring to read breeding from once you are able to generalize 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 info about compounds and elements were discovered during the snip after that.
When more(prenominal) and more elements and compounds were being discovered, scientists found the need to deck out that information of easy glide slope and use for future use. To deck out the information they had pile up they found kinds which was found end-to-end their discoveries as a back to arrange them. Johann Dobereiner was a German chemist who was one of the freshman to make an attempt to bring up the elements. He attempted to overdress them by looking at both physical and chemic properties. In 1817 Johann Dobreniner was able to find a remarkable manikin that... If you want to get a full essay, order it on our website:
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