• isotopes
  • While some radioisotopes, such as strontium-90 (90Sr) and technetium-99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium-40 (40K), are only present due to natural processes, a few isotopes, e.g. tritium (3H), result from both natural processes and human activities. (wikipedia.org)
  • 90Sr, 2 Bq dm−3 137Cs, 5 Bq dm−3 239Pu, 0.001 Bq dm−3 241Am, 0.001 Bq dm−3 Jiří Hála's textbook states that soils vary greatly in their ability to bind radioisotopes, the clay particles and humic acids can alter the distribution of the isotopes between the soil water and the soil. (wikipedia.org)
  • compounds
  • It burns in oxygen to form arsenic trioxide and arsenic pentoxide, which have the same structure as the more well-known phosphorus compounds, and in fluorine to give arsenic pentafluoride. (wikipedia.org)
  • stable
  • Like germanium, selenium, and bromine, which like arsenic succeed the 3d transition series, arsenic is much less stable in the group oxidation state of +5 than its vertical neighbors phosphorus and antimony, and hence arsenic pentoxide and arsenic acid are potent oxidizers. (wikipedia.org)
  • small
  • Phosphorus-32 only exists in small quantities on Earth as it has a short half-life of 14.29 days and so decays rapidly. (wikipedia.org)
  • Medical
  • If at some time a heavenly angel should ask what the Laboratory in the hills of East Tennessee did to enlarge man's life and make it better, I daresay the production of radioisotopes for scientific research and medical treatment will surely rate as a candidate for first place. (oakridger.com)
  • uses
  • The information gathered by mapping the fertiliser uptake show how the plant takes up and uses the phosphorus from fertiliser. (wikipedia.org)
  • contain
  • The sequence of chemical changes which happen to the substrate can then be traced by detecting which molecules contain the phosphorus-32 at multiple time points following the initial treatment. (wikipedia.org)
  • forms
  • Arsenic has a similar electronegativity and ionization energies to its lighter congener phosphorus and as such readily forms covalent molecules with most of the nonmetals. (wikipedia.org)