Ruthenium (Ru)
Ruthenium is the 44th element, a transition metal in the d-block. Its standard atomic weight is 101.07.
Ruthenium
101.07
What the table records
- Atomic number
- 44
- Standard atomic weight
- 101.07
- Group
- 8
- Period
- 5
- Block
- d-block
- Category
- Transition metal
- [Kr] 4d7 5s1
- Valence electrons
- 8
- Typical valence
- Van der Waals radius
- 2.05 Å
- Covalent radius
- 1.46 Å
Molecules containing ruthenium
The lightest named structures in this library that contain Ru.
Ruthenium
Ru · 101.07 g/mol
Ruthenium(2+)
Ru+2 · 101.07 g/mol
Ruthenium dioxide
O₂Ru · 133.07 g/mol
Ruthenium dichloride
Cl₂Ru · 171.98 g/mol
Ruthenium trichloride
Cl₃Ru · 207.43 g/mol
Dibromoruthenium
Br₂Ru · 260.88 g/mol
Diiodoruthenium
I₂Ru · 354.88 g/mol
Dichloro [(R)-(+)-2,2'-bis(diphenylphosphino)-1,1'-binaphathyl] ruthenium(II)
C₄₄H₃₂Cl₂P₂Ru · 794.66 g/mol
Dichlororuthenium--4,7-diphenyl-1,10-phenanthroline (1/3)
C₇₂H₄₈Cl₂N₆Ru · 1,169.19 g/mol
How to read these numbers
The standard atomic weight is an average over the isotopes as they occur naturally, which is why it is rarely a whole number. It is the figure a molar mass calculation uses. Work in mass spectrometry wants the monoisotopic mass of a single isotope instead, which is a different number.
The two radii are not the same measurement. The covalent radius is half the distance between two bonded atoms of the element; the van der Waals radius is how close a non-bonded atom gets before repulsion takes over, and is always the larger. Space-filling models are drawn with the second, ball-and-stick models with the first — which is why the same molecule looks so different in the two.