94 2 · 8 · 18 · 32 · 24 · 8 · 2

Plutonium, Pu, element 94

Actinide· Period 7· f-block

Configuration [Rn]5f⁶7s²

Atomic weight: 244Da
Phase: solid
Density: 19.7g/cm³
Melting point: 913.15K 640 °C
Boiling point: 3,501.15K 3,228 °C
Electronegativity: 1.3

Dense silvery radioactive metallic transuranic element, belongs to the actinoids. Pu-244 is the most stable isotope with a half-life of 7.6*10^7 years. Thirteen isotopes are known. Pu-239 is the most important, it undergoes nuclear fission with slow neutrons and is hence important to nuclear weapons and reactors. Plutonium production is monitored down to the gram to prevent military misuse. First produced by Gleen T. Seaborg, Edwin M. McMillan, J.W. Kennedy and A.C. Wahl in 1940. Description from mendeleev.

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The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for plutonium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.: 244Da; Source: mendeleev
Electron configuration: [Rn]5f⁶7s²; Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰5f⁶6s²6p⁶7s²; Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.: 2 · 8 · 18 · 32 · 24 · 8 · 2; Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.