Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and a potent oxidizing agent that readily forms oxides with most elements as well as with other compounds.

Ozone (O 3), a highly active compound, is formed by the action of an electrical discharge or ultraviolet light on oxygen. Ozone's presence in the atmosphere (amounting to the equivalent of a layer 3 mm thick under ordinary pressures and temperatures) helps prevent harmful ultraviolet rays of the sun from reaching the earth's surface.

L' oxygène est l' élément chimique de numéro atomique 8, de symbole O. C'est la tête de file du groupe des chalcogènes, souvent appelé groupe de l'oxygène.

Element Oxygen (O), Group 16, Atomic Number 8, p-block, Mass 15.999. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content

Oxygen is the 8th element in the periodic table and has a symbol of O and atomic number of 8. It has an atomic weight of 15.999 and a mass number of 16. Oxygen has eight protons and eight neutrons in its nucleus, and eight electrons in two shells. It is located in group sixteen, period two and block p of the periodic table.

2019年12月30日 · Oxygen (O) exists as a colourless, odourless gas in the earth’s atmosphere. Comprising 21% of the earth atmosphere it is vital for life on earth. It has the atomic number 8 in the periodic table and belongs in Group 16. It is a non metal with the symbol O.

Obtenez les faits pour l'élément Oxygène (O) [8] depuis le tableau périodique. Trouvez les données physiques, configurations électroniques, propriétés chimiques, les états d'agrégation, isotopes (avec chaînes de désintégration) aussi bien que des informations historiques.

2016年6月22日 · Troisième élément le plus fréquent dans l'univers, l' oxygène est l'une des pierres angulaires du vivant et forme des composés avec presque tous les autres éléments. L'oxygène a été découvert...

O átomo é a unidade fundamental da matéria e a menor fração capaz de identificar um elemento químico, pois detém sua identidade. O termo átomo deriva do grego e significa indivisível. Ele é formado por um núcleo, que contém nêutrons e prótons, e por elétrons que circundam o núcleo.

Átomo é a partícula que constitui a matéria, ou seja, é tudo aquilo que possui massa e volume. É dividido basicamente em duas regiões: o núcleo, de caráter positivo, e a eletrosfera, de caráter negativo. Apesar de vir do grego, “indivisível”, o átomo é dividido em partículas menores, conhecidas como partículas subatômicas.