Astatine Isotopes

Some articles on astatine, isotopes, isotope, astatine isotope, astatine isotopes:

Astatine - Natural Occurrence
... Astatine is the rarest naturally occurring element that is not a transuranic element, with the total amount in Earth's crust estimated to be less than 28 grams (1 oz) at any given time ... Any astatine that was present at the Earth's formation has long since decayed, and the minute amounts of astatine existing currently have formed through the decay of heavier elements ... While it was previously thought to be the rarest element occurring on the Earth, astatine has lost this status to berkelium, atoms of which can be produced by neutron capture reactions and beta decay in very ...
Astatine-210
... Astatine (At) has 37 known isotopes, all of which are radioactive the range of their mass numbers is from 191 to 229 ... The longest-lived isotope is 210At, which has a half-life of 8.1 hours the longest-lived isotope existing in naturally occurring decay chains is 219At with a half-life ... There are 32 known isotopes of astatine, with atomic masses (mass numbers) of 191 and 193–223 ...
Astatine - Isotopes
... There are 32 known isotopes of astatine, with atomic masses (mass numbers) of 191 and 193–223 ... No stable or even long-lived astatine isotope is known, and no such isotope is expected to exist ... Alpha decay characteristics for sample astatine isotopes Mass number Mass excess Mass excess of daughter Average energy of alpha decay Half-life Probability of alpha decay Alpha half-life 207 −13.243 MeV −1 ...