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For example, the atomic mass constant is exactly known when expressed using the dalton (its value is exactly 1 Da), but the kilogram is not exactly known when using these units, the opposite of when expressing the same quantities using the kilogram.
Naturally occurring terbium (65 Tb) is composed of one stable isotope, 159 Tb. Thirty-seven radioisotopes have been characterized, with the most stable being 158 Tb with a half-life of 180 years, 157 Tb with a half-life of 71 years, and 160 Tb with a half-life of 72.3 days.
Gadolinium isotopes have four metastable isomers, with the most stable being 143m Gd (t 1/2 = 110 seconds), 145m Gd (t 1/2 = 85 seconds) and 141m Gd (t 1/2 = 24.5 seconds). The isotopes with atomic masses lower than the most abundant stable isotope, 158 Gd, primarily decay by electron capture to isotopes of europium .
True Value has filed for Chapter 11 bankruptcy and plans to sell the business to wholesale company Do It Best.. Do It Best has offered to pay $153 million in cash to purchase True Value, according ...
Calculating the value of a classic car can be tricky because the actual cash value doesn’t reflect what it’s worth in the market. Classic car buyers look at the make and model, condition, and ...
By Nathan Layne (Reuters) -Republican presidential candidate Donald Trump's campaign and the Republican National Committee said on Monday they had raised $141 million in May, nearly doubling the ...
Samarium also has twelve known nuclear isomers, the most stable of which are 141m Sm (half-life 22.6 minutes), 143m1 Sm (t 1/2 = 66 seconds), and 139m Sm (t 1/2 = 10.7 seconds). [9] Natural samarium has a radioactivity of 127 Bq /g, mostly due to 147 Sm, [ 66 ] which alpha decays to 143 Nd with a half-life of 1.06 × 10 11 years and is used in ...
Naturally occurring praseodymium (59 Pr) is composed of one stable isotope, 141 Pr. Thirty-eight radioisotopes have been characterized with the most stable being 143 Pr, with a half-life of 13.57 days and 142 Pr, with a half-life of 19.12 hours.