What are isotopes?

Some articles on isotopes, isotope:

Silverness - Isotopes
... Naturally occurring silver is composed of two stable isotopes, 107Ag and 109Ag, with 107Ag being slightly more abundant (51.839% natural abundance) ... Silver's isotopes are almost equal in abundance, something which is rare in the periodic table ... All of the remaining radioactive isotopes have half-lives of less than an hour, and the majority of these have half-lives of less than three minutes ...
Canadian Penning Trap Mass Spectrometer - Development
... mass measurements of short-lived isotopes using radio-frequency (RF) fields ... Accurate mass measurements of particular isotopes such as selenium-68 are important in the understanding of the detailed reaction mechanisms involved in the rapid-proton ... In the current configuration, more than 100 radioactive isotopes have been measured with half-lives much less than a second and with a precision (Δm/m) approaching 10-9 ...
Closure Temperature
... has cooled so that there is no longer any significant diffusion of the parent or daughter isotopes out of the system and into the external environment ... the crystal structure begins to form and diffusion of isotopes slows ... crystal structure has formed sufficiently to prevent diffusion of isotopes ...
History Of Mass Spectrometry - Discovery of Isotopes
... He was able to identify isotopes of chlorine (35 and 37), bromine (79 and 81), and krypton (78, 80, 82, 83, 84 and 86), proving that these natural occurring elements are composed of a ... which rapidly allowed him to identify no fewer than 212 of the 287 naturally occurring isotopes ... His work on isotopes also led to his formulation of the Whole Number Rule which states that "the mass of the oxygen isotope being defined, all the other isotopes ...
Cromium - Characteristics - Isotopes
... Naturally occurring chromium is composed of three stable isotopes 52Cr, 53Cr and 54Cr with 52Cr being the most abundant (83.789% natural abundance) ... All of the remaining radioactive isotopes have half-lives that are less than 24 hours and the majority of these have half-lives that are less than 1 minute ... with manganese isotopic contents and have found application in isotope geology ...