Naturally occurring nickel (28Ni) is composed of five stable isotopes; 58 Ni , 60 Ni , 61 Ni , 62 Ni and 64 Ni , with 58 Ni being the most abundant (68.077% natural abundance).[4] 26 radioisotopes have been characterised with the most stable being 59 Ni with a half-life of 76,000 years, 63 Ni with a half-life of 100.1 years, and 56 Ni with a half-life of 6.077 days. All of the remaining radioactive isotopes have half-lives that are less than 60 hours and the majority of these have half-lives that are less than 30 seconds. This element also has 8 meta states.