76
Os
190.23
Osmium (Os)
Element 76 · Period 6 · Group 8
transition-metal
solid at room temp
d-block
About Osmium
Densest naturally occurring element. Used as tips for fountain pens and record player needles.
Physical Properties
Atomic Mass
190.23 u
State at 25°C
Solid
Melting Point
3033 °C
Boiling Point
5012 °C
Density
22.59 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Xe] 4f¹⁴ 5d⁶ 6s²
Electron Shells
2, 8, 18, 32, 14, 2
Electronegativity
2.2
Atomic Radius
185 pm
Ionization Energy
840 kJ/mol
Oxidation States
+2 to +8
Discovery & History
Discovered By
Smithson Tennant
Discovery Year
1803
Named By
Smithson Tennant
Name origin: Greek: osme (smell)
Frequently Asked Questions
- Is Osmium a metal, nonmetal, or metalloid?
- Osmium is classified as a transition-metal.
- What state is Osmium in at room temperature?
- Osmium is a solid at standard room temperature (25°C).
- What is the atomic mass of Osmium?
- Osmium has an atomic mass of 190.23 atomic mass units (u).
- Who discovered Osmium?
- Osmium was discovered by Smithson Tennant in 1803.
- Where is Osmium on the periodic table?
- Osmium is element number 76, located in period 6 and group 8.