92 2 · 8 · 18 · 32 · 21 · 9 · 2

Uranium, U, element 92

Actinide· Period 7· f-block

Configuration [Rn]5f36d17s2

Atomic weight
238.029Da
Phase
solid
Density
19.1g/cm³
Melting point
1,408.15K 1,135 °C
Boiling point
4,404.15K 4,131 °C
Electronegativity
1.7

White radioactive metallic element belonging to the actinoids. Three natural isotopes, U-238, U-235 and U-234. Uranium-235 is used as the fuel for nuclear reactors and weapons. Discovered by Martin H. Klaproth in 1789. Description from mendeleev.

Back to the table
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

5 of 5 fields have a value for uranium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
238.0289Da
Source: mendeleev
Electron configuration
[Rn]5f36d17s2
Source: mendeleev
Uncertainty of the atomic weight
3×10−5Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f145s25p65d105f36s26p66d17s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 32 · 21 · 9 · 2
Source: Worked outfrom electron configuration