Pu
Actinide

Plutonium

Z 94A 244mass 244

Atomic model

tap a particle

Every nucleon is drawn individually — 94 protons and 150 neutrons packed into the nucleus, with 94 electrons on shells outside.

94+1
Protons

Set the element — change this and it becomes a different atom.

1500
Neutrons

Change only these and you get a different isotope of the same element.

94−1
Electrons

Sit outside the nucleus and decide the chemistry, not the element.

Element data

Nucleons
244 (94 p + 150 n)
Electron shells
2 · 8 · 18 · 32 · 24 · 8 · 2
Valence shell
2 electrons
Atomic mass
244 u
Sample isotope

Plutonium-239 decays with a half-life of 24,110 years.

Open the decay lab