Question

Element that corresponds to the atomic number $18$ is ______

Answer 1

The number of protons in an element determines its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

Complete answer:
Argon is the chemical element with the atomic number $18$ with the symbol $Ar$.
It is a chemical element in the $18th$ group of the periodic table. It is the third most abundant gas in the earth's atmosphere and is a noble gas.
Argon is a noble gas that is chemically inert, but it can mix with other atoms at low temperatures to form exceedingly fragile compounds that exist only at very low temperatures. This element is known as a noble gas since it has no chemical reactivity.
Properties: It is an odourless, colourless gas that doesn't react with anything else. Despite being a gas, argon may form some compounds under extreme conditions. It is distinguished by the fact that it has the same level of solubility in water as oxygen. Thermal conductivity is poor.
Applications: They are used in the metal industry. It is employed in the titanium manufacturing process. It is used to fill the space between the panels in double-dazzled windows.

Note:
Glass, rubber, plastic materials, and some metals can all disperse noble gases. As a result, handling them in laboratories is tough. Argon is primarily used in metallurgical processes to generate an inert atmosphere.