neptunium

/nep-too-nee-uhm, -tyoo-/US // nɛpˈtu ni əm, -ˈtyu- //UK // (nɛpˈtjuːnɪəm) //

镎,海王星,镎类,镎的作用

Definitions

n.名词 noun

1
Chemistry, Physics.
- : a transuranic element produced in nuclear reactors by the neutron bombardment of U-238: decays rapidly to plutonium and then to U-235. Symbol: Np; atomic number: 93.