Ruthenium (Ru) VS Osmium (Os)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Ruthenium (Ru) is an element in the transition metals category with an atomic number of 44. Osmium (Os) is an element in the transition metals category with an atomic number of 76.
Osmium (Os) is 1.8x denser than Ruthenium (Ru). However, Osmium (Os) melts at a higher temperature than Ruthenium (Ru) (a difference of 699.0 Kelvin).
Where do the names come from?
Ru Ruthenium (Ru) Naming History
The name Ruthenium is derived from ''Ruthenia'', the Latin name for Russia
Os Osmium (Os) Naming History
The name Osmium is derived from the Greek word ''osme'', meaning smell.
Related Comparisons
Compare
Ruthenium (Ru)
Osmium (Os)
Category
Transition Metals
Transition Metals
Atomic Number
44
76
Symbol
Ru
Os
Atomic Mass
101.07 u
190.23 u
Group
8
8
Period
5
6
Block
d-block
d-block
Standard State (at 20°C)
solid
solid
Density
12.45 g/cm³
22.59 g/cm³
Melting Point (°C)
2333°C
3033°C
Melting Point (°F)
4231°F
5491°F
Melting Point (K)
2607 K
3306 K
Boiling Point (°C)
4147°C
5008°C
Boiling Point (°F)
7497°F
9046°F
Boiling Point (K)
4423 K
5285 K
Year Discovered:
1844
1803
CAS Number
7440-18-8
02/04/7440
Origin of Name:
The name is derived from ''Ruthenia'', the Latin name for Russia
The name is derived from the Greek word ''osme'', meaning smell.