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 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. Hydrogen .
SP4. Nitrogen .
 Synonyms & Historicals
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. .
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. .
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. .
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. .
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. .
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. .
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. .
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. .
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. .
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. .