Argon | Descriptions, Chemical and Physical Properties, Uses & Facts

Argon | Descriptions, Chemical and Physical Properties, Uses & Facts

Exploring the Noble Gas: Argon's Symbol, Properties, Uses, and Reactions


Argon, a noble gas situated in Group 18 of the periodic table, holds a unique place in the realm of elements. In this blog, we'll delve into the symbol, atomic number, atomic mass, chemical and physical properties, as well as the uses and interesting facts about argon. Additionally, we'll explore its reactions, which are often limited due to its noble gas status.

Chemical Properties:

- Symbol: Ar

- Atomic Number: 18

- Atomic Mass: 39.948 u

Argon is a colorless, odorless, and tasteless gas that constitutes approximately 1% of Earth's atmosphere. It earned its name from the Greek word "argos," meaning inactive or lazy, due to its historical classification as an inert gas.

Physical Properties:

- State: Gas at room temperature

- Density: 1.784 g/L

- Melting Point: -189.3°C

- Boiling Point: -185.9°C

Argon, being a noble gas, is characterized by its stable, non-reactive nature. It is monatomic, meaning it exists as individual atoms rather than forming diatomic molecules like many other gases.


Argon Electron Configuration:

Argon has an atomic number of 18, indicating that it has 18 electrons. The electron configuration of argon is as follows:


This electron configuration represents the distribution of electrons in the various energy levels and sublevels of an argon atom. Each orbital can accommodate a specific number of electrons, and the electron configuration reflects the filling of these orbitals based on the Aufbau principle, Pauli exclusion principle, and Hund's rule. In the case of argon, the outermost energy level (the fourth energy level) is fully occupied, and it is the presence of a completely filled outer electron shell that contributes to argon's stability and inert nature as a noble gas.

Argon Valency:

Argon is a noble gas, and noble gases are characterized by having a completely filled outer electron shell. In the case of argon, its electron configuration is

Since a full outer electron shell is typically considered stable, argon does not readily gain or lose electrons to form chemical bonds with other elements. As a result, argon is chemically inert and does not have a valency in the traditional sense. Valency refers to the number of electrons an atom can gain or lose to achieve a stable, noble gas electron configuration.

For noble gases like argon, their stable electron configurations are achieved by maintaining the existing number of electrons in their outermost shell. Therefore, argon is often referred to as having a valency of 0, indicating that it does not readily form bonds by gaining or losing electrons.

Uses and Facts:

1. Welding:

Argon is commonly used as a shielding gas in welding processes. Its inert nature prevents unwanted reactions with molten metals, providing a stable environment for welding.

2. Light Bulbs:

Argon is often used in incandescent light bulbs to protect the filament from oxidation. The gas helps extend the life of the bulb by reducing the rate of filament evaporation.

3. Laboratory Applications:

In laboratories, argon is utilized as a carrier gas in chromatography and as a blanketing gas to create inert atmospheres for sensitive experiments.

4. Medical Applications:

Argon finds applications in certain medical procedures, including laser surgery, where it is used as a cooling agent for tissues.

5. Deep Sea Diving:

Argon-oxygen mixtures are employed in deep-sea diving to mitigate the effects of high pressure on the human body.

Argon Reactions with Other Elements:

Argon, being a noble gas, typically does not engage in chemical reactions under normal conditions. Its outer electron shell is fully occupied, making it stable and unreactive. Unlike metals or nonmetals that readily form compounds, noble gases prefer to exist as individual atoms. Therefore, argon is not known for forming compounds with other elements.


In conclusion, argon's inert nature, coupled with its various applications, makes it a fascinating element in both scientific and industrial contexts. Its reluctance to react with other elements showcases the unique characteristics of noble gases, contributing to their significance in diverse fields.

Also Read:

Neon | Descriptions, Chemical and Physical Properties, Uses & Facts

Nitrogen | Descriptions, Chemical and Physical Properties, Uses & Facts

Beryllium | Descriptions, Chemical and Physical Properties, Uses & Facts

Hydrogen | Difference between Blue and Green Hydrogen | Hydrogen Fuel

Resolver (Electrical) | Rotary Electrical Transformer | What is the purpose of a resolver?

Full Authority Digital Engine Control (FADEC) System Description & Operation

Post a Comment