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Copper ( 29 Cu) has two stable isotopes, 63 Cu and 65 Cu, along with 28 radioisotopes. The most stable radioisotope is 67 Cu with a half-life of 61.83 hours. Most of the others have half-lives under a minute. Unstable copper isotopes with atomic masses below 63 tend to undergo β + decay, while isotopes with atomic masses above 65 tend to ...
Antimony ( 51 Sb) occurs in two stable isotopes, 121 Sb and 123 Sb. There are 35 artificial radioactive isotopes, the longest-lived of which are 125 Sb, with a half-life of 2.75856 years; 124 Sb, with a half-life of 60.2 days; and 126 Sb, with a half-life of 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour ...
Isotopes of neon (10Ne) In addition, 17 radioactive isotopes have been discovered, ranging from 15. , all short-lived. The longest-lived is 24. with a half-life of 3.38 (2) min. All others are under a minute, most under a second. The least stable is 15. with a half-life of 770 (300) ys ( 7.7 (3.0) × 10−22 s ).
Isotopes of titanium (22Ti) Naturally occurring titanium ( 22 Ti) is composed of five stable isotopes; 46 Ti, 47 Ti, 48 Ti, 49 Ti and 50 Ti with 48 Ti being the most abundant (73.8% natural abundance ). Twenty-one radioisotopes have been characterized, with the most stable being 44 Ti with a half-life of 60 years, 45 Ti with a half-life of 184. ...
Isotopes of europium. Naturally occurring europium ( 63 Eu) is composed of two isotopes, 151 Eu and 153 Eu, with 153 Eu being the most abundant (52.2% natural abundance ). While 153 Eu is observationally stable (theoretically can undergo alpha decay with half-life over 5.5×10 17 years), 151 Eu was found in 2007 to be unstable and undergo alpha ...
= (, /) The equation for N 60 can be rearranged to find the distance to the supernova. =, An example calculation for the distance to the supernova point of origin is given below. This calculation uses speculative values for terrestrial 60 Fe atom surface density (N 60 ≈ 4 × 10 11 atoms 2 /m) and a rough estimate of the mass of 60 Fe ejected ...
Natural nitrogen ( 7 N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14, with the remainder being nitrogen-15. Thirteen radioisotopes are also known, with atomic masses ranging from 9 to 23, along with three nuclear isomers. All of these radioisotopes are short-lived, the longest-lived ...
Natural abundance. Relative abundance of elements in the Earth's upper crust. In physics, natural abundance (NA) refers to the abundance of isotopes of a chemical element as naturally found on a planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for ...