83, die keine beständigen Isotope haben.
Das andere Element ist Promethium (Z = 61). Technetium hat drei langlebige radioaktive Isotope:
97 Tc (T 1/2 = 2,6 x 10 6 Jahre), 98 Tc (T 1/2 = 4,2 x 10 6 Jahre) und 99 Tc (T 1/2 = 2,1 x 10 5 Jahre).
www.lenntech.de83 that have no stable isotopes ;
the other element is promethium (Z = 61). Technetium has three long lived radioactive isotopes:
97Tc (T1/2 =2.6 x 106 years), 98Tc (T1/2 = 4.2 x 106 years) and 99Tc (T1/2 = 2.1 x 105 years).
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