U
Uranium · element 92
Actinide · Solid at room temperature
Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.
Key facts
Atomic mass
238.028913 u
how heavy one atom is
Phase (room temp.)
Solid
Density
19.1 g/cm³
how tightly packed it is
Melting point
1405.3 K (1132 °C)
when solid turns to liquid
Boiling point
4404 K (4131 °C)
when liquid turns to gas
Period
7
its row in the periodic table
Group
3
its column in the periodic table
Block
F-block
the neighbourhood it lives in
Electronegativity
1.38
how strongly it pulls electrons
Electron configuration
[Rn] 5f3 6d1 7s2
where its electrons live
Shells
2 · 8 · 18 · 32 · 21 · 9 · 2
electrons in each layer, inside to out
Discovered by
Martin Heinrich Klaproth
who found it
Source: Wikipedia