neptunium
Element ninety-three
Neptunium is a radioactive metallic element with atomic number 93, the first of the transuranic elements—those heavier than uranium.
It was discovered in 1940 and named after Neptune, following the naming pattern of uranium (after Uranus).
Neptunium occurs in trace amounts in uranium ores and is produced as a byproduct in nuclear reactors.
It has limited practical applications but serves as a precursor in producing plutonium-238 for spacecraft power sources.
Actinide, atomic number 94
- uraniumElement ninety-two
- americiumElement ninety-five, synthetic actinide
- curiumRadioactive actinide, atomic ninety-six
- berkeliumSynthetic actinide, atomic ninety-seven
californium · transuranium · cyclotron · bombardment · superheavy · Berkeley
Gradual organic breakdown
- half-lifePeriod for fifty-percent reduction
- alphaFirst Greek letter
- betaGreek alphabet's second letter
- gammaGreek alphabet's third
radiation · fission · isotope · radionuclide · ionizing · contamination · hazardous · unstable
Heavy radioactive metal series
- protonsPositive nuclear particles
- neutronsUncharged subatomic particles
- electronsNegative charges in atoms
- nucleusCentral controlling part
isotopes · valence · orbitals · ionization · reactivity · metallic · silvery · dense
Controlled fission apparatus
- breederOne who raises stock
- reprocessingHandling material again
- fissileAble to split apart
- weaponsTools for fighting
proliferation · enrichment · criticality · storage · transmutation · irradiation · byproduct
plutonium
Actinide, atomic number 94
- uraniumElement ninety-two
- americiumElement ninety-five, synthetic actinide
- curiumRadioactive actinide, atomic ninety-six
berkelium · californium · transuranium · cyclotron · bombardment · superheavy · Berkeley
decay
Gradual organic breakdown
- half-lifePeriod for fifty-percent reduction
- alphaFirst Greek letter
- betaGreek alphabet's second letter
gamma · radiation · fission · isotope · radionuclide · ionizing · contamination · hazardous · unstable · emissions
actinide
Heavy radioactive metal series
- protonsPositive nuclear particles
- neutronsUncharged subatomic particles
- electronsNegative charges in atoms
nucleus · isotopes · valence · orbitals · ionization · reactivity · metallic · silvery · dense · electronegativity
reactor
Controlled fission apparatus
- breederOne who raises stock
- reprocessingHandling material again
- fissileAble to split apart
weapons · proliferation · enrichment · criticality · storage · transmutation · irradiation · byproduct
- elementsoxygen, hydrogen, carbon, helium, nitrogen
- metalsaluminum, steel, copper, iron, gold
- Synthetic Elementstechnetium, plutonium, americium, curium, berkelium
- Radioactive Elementsuranium, plutonium, radium, radon, thorium
- heavy metalslead, gold, platinum, mercury, uranium
- radioactivityradioactive decay, radioactive isotopes, radioisotopes, radionuclides, half-life