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Ruthenium (Ru) – Element 44 of the periodic table

Ruthenium (symbol Ru) is element number 44 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 101.07, and its phase under standard conditions is Solid. This element sits in period 5 and group 8 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 15, 1. The short electron configuration of Ruthenium is [Kr] 4d⁷ 5s¹. Known uses of Ruthenium include Electronics, Catalyst and Jewelry.

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Properties of Ruthenium

Atomic number
44
Chemical symbol
Ru
Atomic mass
101.07
Category
Transition metal
Period
5
Group
8
Phase
Solid
Protons
44
Electrons
44
Neutrons (approx.)
57
Electron shells
2, 8, 18, 15, 1
Outer-shell electrons
1
Discovered
Karl Ernst Claus (1844)

Electron configuration of Ruthenium

The electron configuration of Ruthenium (Ru), with 44 electrons, is shown below. The last shell (shell 5) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹
Short configuration
[Kr] 4d⁷ 5s¹
Last shell
5s¹

What is electron configuration and how is it written?

Electron shells of Ruthenium

Distribution of 44 electrons of Ruthenium across shells K to O:

  1. K2
  2. L8
  3. M18
  4. N15
  5. O1

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Ruthenium

Frequently asked questions about Ruthenium

What is the atomic number of Ruthenium?

The atomic number of Ruthenium (Ru) is 44; that is, every atom of it has 44 protons.

What is the electron configuration of Ruthenium?

The electron configuration of Ruthenium (Ru) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹; in short form it is [Kr] 4d⁷ 5s¹, and its last shell is 5s¹.

What is the chemical symbol of Ruthenium?

The chemical symbol of Ruthenium is Ru.

Where is Ruthenium located in the periodic table?

Ruthenium is located in period 5 and group 8 and belongs to the “Transition metal” category.

What is the atomic mass of Ruthenium?

The atomic mass of Ruthenium is about 101.07 (atomic mass units).

What is the phase of Ruthenium under normal conditions?

The phase of Ruthenium under standard conditions is Solid.

What are the uses of Ruthenium?

Uses of Ruthenium include Electronics, Catalyst and Jewelry.

Who discovered Ruthenium?

Ruthenium was discovered by Karl Ernst Claus in 1844.

Elements in the same category as Ruthenium (Transition metal)

Scandium (Sc)Titanium (Ti)Vanadium (V)Chromium (Cr)Manganese (Mn)Iron (Fe)Cobalt (Co)Nickel (Ni)Copper (Cu)Zinc (Zn)Yttrium (Y)Zirconium (Zr)Niobium (Nb)Molybdenum (Mo)Technetium (Tc)Rhodium (Rh)Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)

See all Transition metals

Ruthenium’s group 8 neighbours

Iron (Fe)Osmium (Os)Hassium (Hs)

Group 8 of the periodic table