radioactive isotopes
71Isotopes of sodium — There are thirteen recognized isotopes of sodium. 23Na is the only stable isotope. As such, it is considered a monoisotopic element and it has a standard atomic mass: 22.98976928(2) u. Sodium has two radioactive cosmogenic isotopes (22Na, half… …
72Isotopes of lead — Lead (Pb) has four stable isotopes 204Pb, 206Pb, 207Pb, 208Pb and one common radiogenic isotope 202Pb with a half life of 53,000 years. The standard atomic mass is 207.2(1) u. It is the heaviest discovered element to have a stable isotope. (The… …
73Isotopes of thallium — Thallium (Tl) has 25 isotopes which have atomic masses that range from 184 to 210. 203Tl and 205Tl are the only stable isotopes and 204Tl is the most stable radioisotope with a half life of 3.78 years.Thallium 202 (half life 12.23 days) can be… …
74Isotopes of potassium — Potassium (K) has 24 known isotopes. Three isotopes occur naturally: 39K (93.3%), 40K (0.012%) and 41K (6.7%). The standard atomic mass is 39.0983(1) u. Naturally occurring 40K decays to stable 40Ar (11.2%) by electron capture and by positron… …
75Isotopes of silicon — Silicon (Si) has numerous known isotopes, with mass numbers ranging from 22 to 44. 28Si (the most abundant isotope, at 92.23%), 29Si (4.67%), and 30Si (3.1%) are stable; 32Si is a radioactive isotope produced by argon decay. Its half life has… …
76radioactive series — /reɪdioʊˌæktɪv ˈsɪəriz/ (say raydeeoh.aktiv searreez) noun the series of isotopes of various elements through which a radioactive substance decays before it reaches a stable state. The three known spontaneous series start with thorium and two… …
77Isotopes of francium — Francium (Fr) has no stable isotopes. A standard atomic mass cannot be given.An isotope of francium occurring within the radioactive disintegration chain of actinium was known as: * actinium K : 223Fr Table Notes * Values marked # are not purely… …
78Isotopes of radon — There are thirty four known isotopes of radon (Rn). The most stable isotope is 222Rn, which is a decay product (daughter product) of 226Ra, has a half life of 3.823 days and emits alpha particles. 220Rn is a natural decay product of thorium and… …
79Isotopes of tantalum — Natural tantalum (Ta) consists of two isotopes: 180mTa (0.012%) and 181Ta (99.988%). 181Ta is a stable isotope. 180mTa ( m denotes a metastable state) is predicted to decay in three ways: isomeric transition to the ground state of 180Ta, beta… …
80Isotopes of barium — Naturally occurring barium (Ba) is a mix of seven stable isotopes. There are twenty two isotopes known, but most of these are highly radioactive and have half lives in the several millisecond to several minute range. The only notable exceptions… …
