transuranic element

1. A radioactive transuranic metallic element produced by bombarding plutonium with neutrons.
   一种放射性超铀元素，用中子轰击钚时产生。
2. A radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known.
   一种放射性超铀元素，用碳离子轰击锔而合成，已知有种同位素。
3. A radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms.
   一种放射性的超铀金属元素，在用氦原子轰击铀时发现。
4. A radioactive transuranic element; discovered by bombarding curium with alpha particles.
   一种放射性超铀元素，在用α粒子轰击锔时发现。
5. The boundary limit of the periodic system is discussed from both time and space respect in this paper-Transuranic element is unstable.
   本文从时空两个方面讨论了元素周期系的界限。

noun

1. any element having an atomic number greater than 92 (which is the atomic number of uranium)