Ar electron configuration-Electron Configuration Of Argon

Argon is a colorless, odorless gas that is completely inert to all other chemicals. Argon is a chemical element with the atomic number 18 and Ar’s symbol. It is a noble gas and belongs to group 18 of the periodic table. The third most abundant gas in the Earth’s atmosphere is argon.
When an inert atmosphere is required, argon is frequently employed. It provides a blanket environment in which crystals can develop. It is utilized in this way to produce titanium and other reactive elements. In cinematography, argon can be used as a carrier gas. Cryosurgery, refrigeration, fire extinguisher, spectroscopy, and airbag inflation all use this noble gas.

To express the Argon electron configuration, we must first know the Ar atom’s number of electrons. To begin, let us define the electron configuration.

What is the definition of electron configuration?

The distribution of electrons in an element’s atomic orbitals is described by its electron configuration. The number of electrons in the atom and the number of electrons in each orbital are clearly displayed in electron configurations. The number of electrons in each orbital is given in superscript to the right of the orbital name, and each orbital is stated in order.

The electron configuration is often used to illustrate an atom’s orbitals in its ground state, but it may also be used to represent an atom that has ionization into a cationic or anion by accounting for electrons deficit or surplus in subsequent electron shells. Many physical and chemical properties of an element can be traced back to its electron configuration. The valence electrons, which are electrons in the outermost shell, determine the element’s specific chemistry.

There are two ways for ar electron configuration

  • The orbital arrangement of electrons (Bohr principle)
  • The orbital principle (Aufbau principle) 

The electron configuration of Argon through orbit

The electrons in atom travel in a circular path around the nucleus. The term “orbit” refers to these circular paths (shells). We use n to represent these orbits. [n = 1,2,3,4,…, the orbit’s serial number]

The letter K denotes the first orbit, the second by the letter L, the third by the letter M, and the fourth by the letter N. Each orbit has a 2n2 electron holding capacity.

  • The capacity of the K orbit to store electrons is 2n2 = 2 12 = 2 electrons.
  • The L orbit’s electron carrying capacity is 2n2 = 2 22 = 8 electrons.
  • In the M orbit, the greatest electron holding capacity is 2n2 = 2 32 = 18 electrons.
  • In the N orbit, the maximum electron holding capacity is 2n2 = 2 42 = 32 electrons.

Argon has an atomic number of 18. The number of electrons in argon is eighteen; therefore, keep that in mind while designing an electrical arrangement. As a result, the first shell of the argon atom will have two electrons, the second orbit will have eight, and the third shell will have eight electrons. As a result, the number of electrons in each shell of the argon(Ar) atom is in the order 2, 8, and 8.

We can organize elements from 1 to 18 through orbits. According to the Bohr atomic model, the electron configuration of an element with an atomic number greater than 18 cannot be accurately predicted.

Step By Step Guide to Writing Electron Configuration of Argon through orbital

The Aufbau approach involves configuring electrons at the sub-energy level. According to the Aufbau principle, electrons in an atom will initially complete the lowest energy orbital before gradually progressing to the higher energy orbitals. These orbitals are designated by the letters s, p, d, and f. 

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

  • To express the Argon electron configuration, we must first know the Ar atom’s number of electrons.
  • Let us note that argon contains 18 electrons in ar electron configuration.
  • We’ll put all 18 electrons in orbitals around the nucleus of the Argon atom when we write the ar electron configuration.
  • The argon’s initial two electrons enter the 1s orbital. A maximum of two electrons can be found in an s-orbital. Because the 1s orbital can only hold two electrons, argon’s next two electrons are assigned to the 2s orbital.
  • The six electrons after that will be in the 2p orbital.
  • The p orbital has a maximum capacity of six electrons.
  • Six electrons will be placed in the 2p orbital, followed by two in the 3s orbital.
  • We’ll shift to the 3p to place the remaining six electrons because the 3s is now full.
  • As a result, the electron configuration of Argon will be 1s22s22p63s23p6.
  • The third energy level, which has eight electrons and is thus full (3s23p6), is referred to as a noble gas.

Argon’s electron configuration reveals that the orbit at the end of the atom is packed with electrons. Because argon’s last orbit is full of electrons, it does not wish to exchange or share any of them. And because it has no electrons to share, argon does not form any compounds.

The electron configuration of argon reveals that there are no unpaired electrons in the argon atom. As a result, the argon atom’s valency is 0.

Chemical bonding and chemical reactions are not a part of their lives. They are known as inert elements because of this. At normal temperatures, inert elements exist as gases. Inert elements are referred to as inert gases because of this. Inert gas is referred to be a noble gas for the same reason.



Argon (atomic number 18) has the electrical configuration 1s22s22p63s23p6.The Aufbau Principle is used to write the electrical configuration of components. The electrons are filled according to the increasing energy level of orbitals in the Aufbau Principle.
According to the Aufbau Principle, first identify the atomic number of the element (for example, argon has atomic number 18) and then fill the electrons in the following order: 1s22s22p63s23p6.