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The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM. CID10 - Classificação Internacional de Doenças DeCS Português DeCS Inglês DeCS Espanhol DeCS Espanha DeCS Português com escopo DeCS Inglês com escopo DeCS Espanhol com escopo DeCS Espanha com escopo LILACS - LILACS Regional
DeCS Categories D01 Inorganic Chemicals . D01.268 Elements . D01.268.150 Carbon . D01.268.150.075 Carbon Isotopes . D01.268.185 Chalcogens . D01.268.185.550 Oxygen . D01.268.185.550.500 Oxygen Isotopes . D01.268.380 Halogens . D01.268.380.400 Iodine . D01.268.380.400.500 Iodine Isotopes . D01.268.406 Hydrogen . D01.268.549 Metals, Alkali . D01.268.549.750 Sodium . D01.268.549.750.500 Sodium Isotopes . D01.268.556 Metals, Heavy . D01.268.556.185 Cobalt . D01.268.556.185.500 Cobalt Isotopes . D01.268.556.322 Gold 4685 . D01.268.556.322.500 Gold Isotopes . D01.268.557 Metals, Light . D01.268.557.650 Sodium . D01.268.557.650.500 Sodium Isotopes . D01.268.604 Nitrogen . D01.268.604.500 Nitrogen Isotopes . D01.268.613 Noble Gases . D01.268.613.350 Helium . D01.268.956 Transition Elements . D01.268.956.155 Cobalt . D01.268.956.155.500 Cobalt Isotopes . D01.268.956.186 Gold 4685 . D01.268.956.186.500 Gold Isotopes . D01.362 Gases . D01.362.340 Hydrogen . D01.362.625 Nitrogen . D01.362.625.500 Nitrogen Isotopes . D01.362.641 Noble Gases . D01.362.641.352 Helium . D01.362.670 Oxygen . D01.362.670.300 Oxygen Isotopes . D01.496 Isotopes . D01.496.123 Carbon Isotopes . D01.496.239 Cobalt Isotopes . D01.496.381 Gold Isotopes . D01.496.448 Iodine Isotopes . D01.496.586 Nitrogen Isotopes . D01.496.625 Oxygen Isotopes . D01.496.807 Sodium Isotopes . D01.552 Metals . D01.552.528 Metals, Alkali . D01.552.528.850 Sodium . D01.552.528.850.500 Sodium Isotopes . D01.552.544 Metals, Heavy . D01.552.544.185 Cobalt . D01.552.544.185.500 Cobalt Isotopes . D01.552.544.322 Gold 4685 . D01.552.544.322.500 Gold Isotopes . D01.552.547 Metals, Light . D01.552.547.725 Sodium . D01.552.547.725.500 Sodium Isotopes . SP4 Environmental Health . SP4.011 Science . SP4.011.097 Chemistry . SP4.011.097.063 Elements . SP4.011.097.063.904 Hydrogen . SP4.011.097.063.939 Nitrogen .		Terms  Synonyms & Historicals Documents LILACS e MDL   Hydrogen . Hydrogen-1 . Hydrogen 1 . The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM. . 1.00   Gold Isotopes . Isotopes, Gold . Stable gold atoms that have the same atomic number as the element gold, but differ in atomic weight. Au-197 is a stable isotope. . 0.39   Carbon Isotopes . Isotopes, Carbon . Stable carbon atoms that have the same atomic number as the element carbon, but differ in atomic weight. C-13 is a stable carbon isotope. . 0.39   Iodine Isotopes . Isotopes, Iodine . Stable iodine atoms that have the same atomic number as the element iodine, but differ in atomic weight. I-127 is the only naturally occurring stable iodine isotope. . 0.38   Helium . Helium-4 . Helium 4 . A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. . 0.38   Nitrogen . An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells. . 0.37   Cobalt Isotopes . Isotopes, Cobalt . Stable cobalt atoms that have the same atomic number as the element cobalt, but differ in atomic weight. Co-59 is a stable cobalt isotope. . 0.37   Sodium Isotopes . Isotopes, Sodium . Stable sodium atoms that have the same atomic number as the element sodium, but differ in atomic weight. Na-23 is a stable sodium isotope. . 0.36   Nitrogen Isotopes . Isotopes, Nitrogen . Stable nitrogen atoms that have the same atomic number as the element nitrogen, but differ in atomic weight. N-15 is a stable nitrogen isotope. . 0.36   Oxygen Isotopes . Isotopes, Oxygen . Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes. . 0.36