Element 44

Ruthenium (Ru)

44

Ru

ruthenium

Metal · d block · group 8, period 5

Electron configuration: $[\mathrm{Kr}]\,5s^{1}\,4d^{7}$
Unpaired electrons: 4 (paramagnetic)
Molar mass: 101.07 g/mol
Electronegativity: 2.2
Atomic radius: 134 pm
First ionization energy: 710 kJ/mol
Next ionization energies: 1,617, 2,747
Electron affinity: 101 kJ/mol released

Practice

Practice ruthenium

No course questions are about ruthenium specifically, but these lessons cover what you need.

Where it comes up in the course