“neptunium”的概念、定义、翻译、参考文献-科学参考

neptunium

Physics

Symbol Np. A radioactive metallic transuranic element belonging to the actinoids; a.n. 93; r.a.m. 237.0482. The most stable isotope, neptunium–237, has a half-life of 2.2×10⁶ years and is produced in small quantities as a by-product by nuclear reactors. Other isotopes have mass numbers 229–236 and 238–241. The only other relatively long-lived isotope is neptunium–236 (half-life 5×10³ years). The element was first produced by Edwin McMillan (1907–91) and Philip Abelson (1913–2004) in 1940. It was the first transuranic element to be discovered.

Chemistry

A radioactive metallic transuranic element belonging to the actinoids; a.n. 93; r.a.m. 237.0482. The most stable isotope, neptunium-237, has a half-life of 2.2×10⁶ years and is produced in small quantities as a by-product by nuclear reactors. Other isotopes have mass numbers 229–236 and 238–241. The only other relatively long-lived isotope is neptunium–236 (half-life 5×10³ years). The element was first produced by Edwin McMillan (1907–91) and Philip Abelson (1913–2004) in 1940.
https://www.webelements.com/neptunium/ Information from the WebElements site

单词	neptunium
释义	neptunium Physics Symbol Np. A radioactive metallic transuranic element belonging to the actinoids; a.n. 93; r.a.m. 237.0482. The most stable isotope, neptunium–237, has a half-life of 2.2×10⁶ years and is produced in small quantities as a by-product by nuclear reactors. Other isotopes have mass numbers 229–236 and 238–241. The only other relatively long-lived isotope is neptunium–236 (half-life 5×10³ years). The element was first produced by Edwin McMillan (1907–91) and Philip Abelson (1913–2004) in 1940. It was the first transuranic element to be discovered. Chemistry A radioactive metallic transuranic element belonging to the actinoids; a.n. 93; r.a.m. 237.0482. The most stable isotope, neptunium-237, has a half-life of 2.2×10⁶ years and is produced in small quantities as a by-product by nuclear reactors. Other isotopes have mass numbers 229–236 and 238–241. The only other relatively long-lived isotope is neptunium–236 (half-life 5×10³ years). The element was first produced by Edwin McMillan (1907–91) and Philip Abelson (1913–2004) in 1940. https://www.webelements.com/neptunium/ Information from the WebElements site
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