How many valence electrons does Argon have?

What is the valency of argon(Ar) Valence electrons

Argon is an inert elements and its symbol, ‘Ar’ is it. Argon atoms are not involved in the formation or dissolution of bonds. This article discusses in detail the valence electrons for argon(Ar). Argon is the third most abundant gas within the Earth’s atmosphere at 0.934% (9340 ppmv). It is twice as common as water vapour (which averages around 4000 ppmv but can vary greatly), 23 times more abundant than carbon dioxide (4000 ppmv), and over 500 times more abundant than neon (18.ppmv). Argon, which accounts for 0.00015% in Earth’s crust is the most abundant noble gases.

Argon element


Sir William Ramsay, a Scottish Chemist, and Lord Rayleigh (an English Chemist), discovered Argon in 1894. Argon is the third most abundant element in the Earth’s atmosphere. Argon is extracted from the air byproducts of the production oxygen, and nitro.

Argon can be used whenever an inert atmosphere needs to be maintained. Argon is used to protect the filaments of fluorescent and incandescent light bulbs from oxygen corrosion. Argon can also be used to create inert atmospheres that are suitable for arc welding, semiconductor crystal growth, and other processes that require protection from other atmospheric gases.


Argon is used often when an inert atmosphere needs to be maintained. This is how argon can be used to produce titanium and other reactive elements. It is used in welding to protect the weld surface and in incandescent lights to prevent oxygen from corroding filaments.

Argon is used to make fluorescent tubes and low energy light bulbs. Low-energy light bulbs often contain mercury and argon gas. The gas is converted to electricity by the bulb’s switch, which generates ultraviolet light. The UV light activates the bulb’s inner surface, causing it to glow brightly. Double-glazed windows use Argon to fill the spaces between the panes. Luxury cars may have argon in their tyres to reduce road noise and protect rubber.

Position of Argon in the periodic table

Position of Argon in the periodic table


There are 22 known argon isotopes, ranging in range from Ar-31 to Ar-50 and Ar-53. Natural argon is composed of three stable isotopes, Ar-36 (3.4%), Ar-38 (0.6%), and Ar-40 (99.5%). Half-life of Ar-39 = 269 years. It is used to determine the age and geological history of igneous rocks, groundwater, and ice cores.

Natural abundance

Argon is the third most common atmospheric gas and makes up 0.94%. Since the Earth formed, levels have increased gradually because radioactive potassium-40 decays into argon. The distillation of liquid oxygen is a commercial way to obtain argon.

atomic number 18
atomic weight [39.792, 39.963]
boiling point −185.7 °C (−302.3 °F)
melting point −189.2 °C (−308.6 °F)
density (1 atm, 0° C) 1.784 g/litre
oxidation state 0
electron config. 1s22s22p63s23p6

Biological role

Argon is not known to have any biological function.


Argon is non-toxic because it is inert. It is a common component of the air we inhale every day. Blue argon lasers use argon to treat eye defects and eliminate tumors. Argon gas can be used to replace nitrogen in underwater breathing mixes (Argox), which may help lower the risk of decompression sickness. Argon is not toxic, but it is much more dense than air. It can pose a danger of asphyxiation in enclosed spaces, especially near ground level.

What are the valence electrons in argon (Ar)?

Argon is an element in group-18. The valence electron refers to the number of electrons within the shell’s last orbit. The valence electrons are the total number of electrons found in the shell following the electron configuration. The properties of an element are determined by the valence electrons. They also participate in the formation bonds.

What are the valence electrons of argon(Ar)

What number of protons, electrons, and neutrons does an Ar atom contain?

The nucleus can be found in the middle of an atom. The nucleus is home to protons and neutrons. 18. The number of protons in argon is called the atomic number. Eighteen protons are found in argon. The nucleus contains an electron shell that is equal to the protons. An argon atom can have eighteen electrons.

The difference between the number atoms and the number atomic masses is what determines the number neutrons in an element. This means that neutron number (n) = atomic mass (A) + atomic number (Z).

We know that the Atomic Number of Argon is 18 and the Atomic Mass Number is 40 (39.4 u). Neutron (n) = 40 – 18 = 22. The number of neutrons found in argon (Ar) is therefore 22.

Valence is the ability of an atom of a chemical element to form a certain number of chemical bonds with other atoms. It takes values from 1 to 8 and cannot be equal to 0. It is determined by the number of electrons of an atom spent to form chemical bonds with another atom. The valence is a real value. Numerical values of valence are indicated with roman numerals (I,II, III, IV, V, VI, VII, VIII).

How can you calculate the number valence electrons within an argon (Ar) atom

These are the steps to determine the valence electron. One of these is the electron configuration. Without an electron configuration, it is impossible to determine the valence of an electron. It is easy to identify the configuration of each element. However, it is possible to identify valence electrons by placing electrons according the Bohr principle. We will now learn how to identify the valence electron in argon (Ar).

Determining the total electron count in argon (Ar)

First, we must know the number of electrons present in the argon-atom. You need to know how many protons are in argon to determine the number electrons. To know the number protons, you must know the atomic number for the element argon. A periodic table is required to determine the atomic number. The periodic table contains the atomic number for argon (Ar) elements. The number of protons is called the atomic number. The nucleus also contains electrons that are equal to protons.

This means that we can now say that the number of electrons in the argon-atom is equal to its atomic number. The atomic number for argon can be seen in the periodic table at 18. This means that the total electron count for argon is 18.

The terms “oxidation degree” and “valence” may not be the same, but they are numerically almost identical. The conditional charge of an atom’s atom is called the oxidation state. It can be either positive or negative. Valence refers to the ability of an atom form bonds. It cannot have a negative value.

You will need to perform electron configuration of argon (Ar)

Important step 2 is. This step involves the arrangement of electrons in argon. The total number of electrons in argon atoms is eighteen. The electron configuration for argon shows there are two electrons within the K shell, eight inside the L shell and eight inside the M shell. The first shell of argon contains two electrons, while the second shell has eight and the third shell has eight. Through the sub-orbit, the electron configuration for argon is 1s2 2s2 2p6 3s2 3p6.

Calculate the total electrons and determine the valence shell

The third step is to determine the orbit of the valence shell. The valence shell is the last shell after the electron configuration. A valence electron is the total number of electrons found in a valenceshell. The electron configuration for argon shows that its last shell has eight (3s23p6) electrons. The valence electrons in argon (Ar) have eight.

  1.  The valence is a numerical characteristic of the ability of atoms of a given element to bond with other atoms.
  2. The valence of hydrogen is constant and equal to one.
  3. The valence of oxygen is also constant and equal to two.
  4. The valence of most of the other elements is not constant. It can be determined by the formulas of their binary compounds with hydrogen or oxygen.

What makes argon (Ar) an inert gaz?

Inert gas is the element group 18 of the periodic table. Group-18’s inert gases are neon(Ne), Helium(He), Ar, Ar, krypton (Kr), and radon (Rn). The element that makes up group-18 is argon. The electron configuration of Argon shows that the orbit at argon’s end is full of electrons. Argon doesn’t want to share or exchange electrons, because the orbit at the end of argon contains electrons. Argon does not make any compounds, as it doesn’t share any electrons. They are not involved in chemical bonds or chemical reactions. They are known as inert elements. At normal temperatures, the inert elements take the form of gas. Inert gases are the name for inert elements. Inert gas can also be called a noble gas.

Reasons why argon (Ar) is placed in group-18

The electron configuration for argon indicates that there are 8 electrons in the last shell(orbit) of an argon atom. The number of electrons in an element’s last orbit is determined by the number of elements in it. The group of argon has 8 electrons, but argon can be considered an inert element. All inert elements are assigned to group number 18 on the periodic table. Argon is therefore placed in group-18, instead of group-8.

What is the valency for argon (Ar)?

Valency (or valence) is the ability of an element’s atom to join another atom in the formation of a molecule. The valency is the number of unpaired electrons found in an element’s last orbit. The electron configuration for argon indicates that there are no unpaired electrons in the atom. Eight electrons are found in the last orbit of an Argon atom.

What is the valency of argon(Ar)

The valency of an argon atom therefore is 0.


  • 18 is the atomic number (number protons in the nucleus).
  • 39.948 is the average mass of an atom’s atomic weight.
  • Atomic symbol (on the Periodic Tab of the Elements: Ar
  • Most common isotopes: Ar-40 (99.6035 percent natural abundance), Ar-40 (0.0629 percent natural abundance), Ar-36 (0.3336 percent natural abundance)
  • Density: 0.0017837 kg per cubic centimeter
  • Melting point: minus 308.83 degrees Fahrenheit (minus 189.35 degrees Celsius)
  • Boiling point: minus 302.53 F (minus 185.85 C)
  • Gas at room temperature: Phase
  • Number of stable isotopes (atoms with different numbers of neutrons from the same element): 25; 3.


  • Brown, T. L.; Bursten, B. E.; LeMay, H. E. (2006). J. Challice; N. Folchetti, eds. Chemistry: The Central Science (10th ed.).
  • Robert L. Kelly, David Hurst Thomas, Archaeology., Sixth Edition, 2012.
  • Lide, D. R. (2005). “Properties of the Elements and Inorganic Compounds; Melting, boiling, triple, and critical temperatures of the elements”.
  • Mary Elvira Weeks, The Discovery of the Elements. XVIII. The Inert Gases., J. Chem. Educ., 1932.
Alexander Stephenson

Candidate of Chemical Sciences, editor-in-chief of Lecturer at several international online schools, member of the jury of chemistry competitions and author of scientific articles.

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