44
Ru
ruthenium
101.07

General properties

Group
group 8
Period
period 5
Category
transition metals
Standard atomic weight
101.07(2)
Melting point
2607 K (2334 °C)
Boiling point
4423 K (4150 °C)
Phase at STP
solid

Additional properties

Block
d-block
Electron configuration
[Kr] 4d⁷ 5s¹
Electrons per shell
2, 8, 18, 15, 1
Electronegativity
2.2
Density
12.45 g/cm³
Oxidation states
−4, −2, 0, +1, +2, +3, +4, +5, +6, +7, +8 (a mildly oxide)
CAS Number
7440-18-8