44
Ru
101.07
Ruthenium (Ru)
Element 44 · Period 5 · Group 8
transition-metal
solid at room temp
d-block
About Ruthenium
Rare platinum-group metal used in electrical contacts and catalysts.
Physical Properties
Atomic Mass
101.07 u
State at 25°C
Solid
Melting Point
2334 °C
Boiling Point
4150 °C
Density
12.45 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Kr] 4d⁷ 5s¹
Electron Shells
2, 8, 18, 15, 1
Electronegativity
2.2
Atomic Radius
178 pm
Ionization Energy
711 kJ/mol
Oxidation States
+2 to +8
Discovery & History
Discovered By
Karl Ernst Claus
Discovery Year
1844
Named By
Karl Ernst Claus
Name origin: Latin: Ruthenia (Russia)
Frequently Asked Questions
- Is Ruthenium a metal, nonmetal, or metalloid?
- Ruthenium is classified as a transition-metal.
- What state is Ruthenium in at room temperature?
- Ruthenium is a solid at standard room temperature (25°C).
- What is the atomic mass of Ruthenium?
- Ruthenium has an atomic mass of 101.07 atomic mass units (u).
- Who discovered Ruthenium?
- Ruthenium was discovered by Karl Ernst Claus in 1844.
- Where is Ruthenium on the periodic table?
- Ruthenium is element number 44, located in period 5 and group 8.