isotopic mass
41Isotopes of chromium — Naturally occurring chromium (Cr) is composed of four stable isotopes; 50Cr, 52Cr, 53Cr, and 54Cr with 52Cr being the most abundant (83.789% natural abundance). 50Cr is suspected of decaying by β+β+ to 50Ti with a half life of (more than)… …
42Isotopes of cobalt — Naturally occurring cobalt (Co) is composed of 1 stable isotope, 59Co. 28 radioisotopes have been characterized with the most stable being 60Co with a half life of 5.2714 years, 57Co with a half life of 271.79 days, 56Co with a half life of 77.27 …
43Isotopes of caesium — Caesium (Cs) has 40 known isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest lived radioisotopes are 135Cs with a half life of 2.3 million years, 137Cs with a half life of 30.1671… …
44Isotopes of copper — Copper (Cu) has two stable isotopes, 63Cu and 65Cu, along with 27 radioisotopes. The most stable of these is 67Cu with a half life of 61.83 hours. The least stable is 54Cu with a half life of approximately 75 ns. Most have half lives… …
45Isotopes of nickel — Naturally occurring nickel (Ni) is composed of five stable isotopes; 58 Ni, 60 Ni, 61 Ni …
46Isotopes of radium — Radium (Ra) has no stable isotopes. A standard atomic mass cannot be given. The longest lived, and most common, isotope of radium is 226Ra with a half life of 1600 years. 226Ra occurs in the disintegration chain of 238U (often referred to as the… …
47Isotopes of mercury — There are seven stable isotopes of mercury (Hg) with 202Hg being the most abundant (29.86%). The longest lived radioisotopes are 194Hg with a half life of 444 years, and 203Hg with a half life of 46.612 days. Most of the remaining radioisotopes… …
48Isotopes of niobium — Naturally occurring niobium (Nb), element 41, is composed of one stable isotope (93Nb). 93Nb is the lightest nuclide theoretically susceptible to spontaneous fission, and although this has never been observed, it makes niobium theoretically the… …
49Isotopes of neptunium — Neptunium (Np) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 239Np in 1940, produced by bombarding 238U with neutrons to …
50Isotopes of mendelevium — Mendelevium (Md) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 256Md (which was also the first isotope of any element… …
