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Deuterium, 2 H (atomic mass 2.014 101 777 844 (15) Da), the other stable hydrogen isotope, has one proton and one neutron in its nucleus, called a deuteron. 2 H comprises 26–184 ppm (by population, not mass) of hydrogen on Earth; the lower number tends to be found in hydrogen gas and higher enrichment (150 ppm) is typical of seawater.
Formula: D 2 or 2 1 H 2. Density: 0.180 kg/m 3 at STP (0 °C, 101325 Pa). Atomic weight: 2.0141017926 Da. Mean abundance in ocean water (from VSMOW) 155.76 ± 0.1 atoms of deuterium per million atoms of all isotopes of hydrogen (about 1 atom of in 6420); that is, about 0.015% of all atoms of hydrogen (any isotope) Data at about 18 K for 2 H 2 ...
Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H 2, sometimes called dihydrogen, [11] hydrogen gas, molecular hydrogen, or simply hydrogen. It is colorless, odorless, [12] non-toxic, and highly combustible.
Hydrogen-rich ordinary water effects neutron absorption in nuclear fission reactors: Usually, neutrons are so strongly absorbed by normal water that fuel enrichment with a fissionable isotope is required. (The number of neutrons produced per fission depends primarily on the fission products.
Naturally occurring water is almost completely composed of the neutron-less hydrogen isotope protium. Only 155 ppm include deuterium (2 H or D), a hydrogen isotope with one neutron, and fewer than 20 parts per quintillion include tritium (3 H or T), which has two neutrons. Oxygen also has three stable isotopes, with 16 O present in 99.76%, 17 O ...
Depiction of a hydrogen atom showing the diameter as about twice the Bohr model radius. (Image not to scale) A hydrogen atom is an atom of the chemical element hydrogen.The electrically neutral hydrogen atom contains a single positively charged proton in the nucleus, and a single negatively charged electron bound to the nucleus by the Coulomb force.
Neutron porosity measurement employs a neutron source to measure the hydrogen index in a reservoir, which is directly related to porosity. The Hydrogen Index (HI) of a material is defined as the ratio of the concentration of hydrogen atoms per cm 3 in the material, to that of pure water at 75 °F.
Heavy water (deuterium oxide, 2 H 2 O, D 2 O) is a form of water in which hydrogen atoms are all deuterium (2 H or D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (1 H, also called protium) that makes up most of the hydrogen in normal water. [3]