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Pa: 2·8·18·32·20·9·2

elements · 91 / 118 · All 118

Pa

Protactinium

Z 
91
Mass 
231.036
Lifeforce 
Earth
A road leads to the far horizon, a small figure approaching along it.
Plate · Protactinium Protactinium bears its name for now, its story is still on the way.

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

Forged in the collision of neutron stars, among the rarest events in the cosmos. Older than the Sun.

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

Pa · Neutron stars

Forged in the collision of neutron stars, among the rarest events in the cosmos. Older than the Sun.

8 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.