Ru Electron Configuration | Ruthenium Electron Configuration

Ru Electron Configuration is the process of disturbing electrons in their respective shells. Ruthenium is a chemical element with the symbol Ru and atomic number 44. It is a rare transition metal that belongs to the platinum group of the periodic table. A minor application for ruthenium is in platinum alloys and as a chemistry catalyst. A new application of ruthenium is the capping layer for extreme ultraviolet photomasks. Ruthenium is generally found in ores with the other platinum group metals in the Ural Mountains and North and South America. 
Ruthenium is a polyvalent hard white metal, is a member of the platinum group, and is in group 8 of the periodic table. Whereas all other groups of 8 elements have two electrons in the outermost shell, in ruthenium, the outer shell has only one electron (the final electron is on a lower surface). It has four crystal modifications and does not tarnish at ambient conditions, and it oxidizes upon heating to 800 °C.

Ruthenium Electron Configuration

Electron Configuration is the arrangement of electrons in different orbits and orbitals of an atom in a particular order. In other words, Ruthenium Electron Configuration or ru electron configuration is the arrangement of electrons in different trajectories of a Ruthenium atom. The ru electron configuration atom can be done in two ways.


  • The electrons’ orbital configuration (Bohr principle)
  • The electrons’ orbital configuration (Aufbau principle)

The electrons' orbital configuration (Bohr principle)

We can make a ruthenium electron configuration using two principles. Bohr Principle and Aufbau Principle. Scientist Niels Bohr was the first to explain the atom’s orbit. He provided a model of the atom in 1913. The whole idea of the orbit is given there. The atom’s electrons revolve around the nucleus in a certain circular path. Orbits are circular paths. These orbits are expressed by n. [n = 1,2,3,4 . . . The serial number of the orbit]. It follows the formula 2n2 to hold each electron in orbit.


  • The electron storage capacity of the K orbit is 2n2 = 2 12 = 2 electrons.
  • The electron carrying capacity of the L orbit is 2n2 = 2 22 = 8 electrons.
  • The maximum electron retention capacity in the M orbit is 2n2 = 2 32 = 18 electrons.
  • The greatest electron retention capacity in the N orbit is 2n2 = 2 42 = 32 electrons.


The first shell, K, holds a maximum of 2 electrons, the second shell, L, carries a maximum of 8 electrons, and the third shell. M has a maximum of 18 electrons, and in the last shot, N holds a maximum of 32 electrons.

The electrons' orbital configuration (Aufbau principle)

In the Aufbau method, electrons are set up at the sub-energy level. The Aufbau principle predicts that electrons in an atom will initially fill the lowest energy orbital before progressively moving to the higher energy orbitals. The letters S, P, D, and F show the orbits. 


The orbital number of the s-subshell is one, three in the p-subshell, five in the d-subshell, and seven in the f-subshell. Each orbital can have a maximum of two electrons. The sub-energy level ‘s’ can hold a maximum of two electrons, ‘p’ can hold a maximum of six electrons, ‘d’ can hold a maximum of ten electrons, and ‘f’ can hold a maximum of fourteen electrons.


Here is the step-by-step guide to writing the ru electron configuration.


  • To express the Ruthenium electron configuration, we must first know how many electrons the Ru atom has.
  • Since ru has 44 atomic numbers, we put all 18 electrons in orbitals around the nucleus of the Argon atom when we write the ar electron configuration.
  • The first two electrons of ruthenium enter the 1s orbital. The s-orbital can have a maximum of two electrons. Therefore, the next two electrons enter the 2s orbital. The p-orbital can have a maximum of six electrons. So, the following six electrons enter the 2p orbital. The second orbit is now complete. So, the remaining electrons will enter the third orbit.
  • Then the two electrons will enter the 3s orbital, and the next six electrons will be in the 3p orbital of the third orbit. The 3p orbital is now complete. So, the next two electrons will enter the 4s orbital, and ten will enter the 3d orbital. The 3d orbital is now full. So, the following six electrons enter the 4p orbital.
  • The 4p orbital is now complete. Then next two electrons will enter the 5s orbital. But the values of the 4d & 5s orbitals of ruthenium are almost the same. Due to the fascination of electrons in the nucleus, one electron moves from 5s to 4d.
  • So next, an electron will enter the 5s orbital, and the remaining seven electrons enter the 4d orbital.
  • Hence, the Ruthenium electron configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d7 5s1. In short, Ru electron configuration is [Kr] 4d7 5s.

How many neutrons does a ruthenium atom have?

The number of electrons and protons in an atom is the same, but the number of neutrons differs. We already know that the nucleus is at the center of the atom. There are two types of particles in the middle. One is a positively charged particle proton, and the other is a charge-neutral neutron. 


Almost all the mass of the atom is accumulated in the nucleus. Therefore, Atomic mass is the mass of the nucleus. The nucleus is made up of protons and neutrons. Therefore, atomic mass refers to the total mass of protons and neutrons. Ie. Atomic mass (A) = Nucleus mass = Total mass of protons and neutrons (p + n).

Thus, the difference between the number of atomic masses and the number of atoms results in the number of neutrons in an element. That is neutron number (n) = nuclear mass number (A) – atomic number (Z).

 Ie. 101-44= 57


The above electron configuration shows that the last ruthenium shell has an electron and the d-orbital has seven electrons. Therefore, the valence electrons of ruthenium are eight. The elements with 1, 2, or 3 electrons in the last shell donate the electrons in the previous surface during bond formation. Cations are the elements that form bonds by donating electrons.