Skip to content
Np: 2·8·18·32·22·9·2

elements · 93 / 118 · All 118

Np

Neptunium

Z 
93
Mass 
237
Lifeforce 
Earth
A small blue planet stands in the dark sky behind a larger one.
Plate · Neptunium Neptunium follows uranium as distant Neptune follows Uranus across the sky.

Stable earth: holds form, endures, builds the structures on which all else stands. The slow time of matter, the patience of mountains.

Synthesized by human hands in particle accelerators; does not occur stably in nature.

Family portrait: this element's own portrait is not written yet. Mendeleev left gaps; we label ours.

Tool · Cosmic origin

Where your atoms come from

Np · Lab

Synthesized by human hands in particle accelerators; does not occur stably in nature.

28 of the 118 elements share this origin.

Choose a stage: click, or arrow keys. · Cosmic nucleosynthesis · current standard model

Tool · Periodic table

Your place in the system

  • Fire
  • Water
  • Air
  • Earth
  • Source

Click any element to go there.