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Hace 17 horas · However, after the discovery of the long-lived 237 Np isotope in 1942 by Glenn Seaborg and Arthur Wahl, forming weighable amounts of neptunium became a realistic endeavor. [20] [73] Its half-life was initially determined to be about 3 million years (later revised to 2.144 million years), confirming the predictions of Nishina and Kimura of a very long half-life.
- a = 666.3b = 472.3c = 488.7
- Orthorhombic
- Pnma
- (α→β) 282 °C
