Question

The most abundant noble gas in atmosphere is:
A. Neon
B. Argon
C. Xenon
D. Krypton

Answer 1

We know that noble gases are also called inert gases. The electron shell of these gases is completely filled and has no tendency to lose or gain any electron. Due to this, they do not react with any chemical compound in the environment and hence known as Noble gases.

Complete step by step answer:
Argon is the first noble gas to be discovered in the periodic table. Its atomic number is 18 and it has a complete valence as its electron shells are completely filled with electrons. It is the third most abundant gas in the environment, but it is also the first most abundant noble gas in the environment.
Neon is a noble gas with an atomic number 10. It is colorless and odorless. It was discovered in 1898 along with two other gases krypton and xenon and are known as rare elements as they are not that much available in nature.
Xenon is a noble gas with an atomic number 54. It is also colorless and odorless in nature and present in trace amount only.
Krypton is a noble gas with an atomic number 36. It is also colorless and odorless gas commonly used with other noble gases in fluorescent lamps for lights.

So, the correct answer is Option B.

Note: All the noble gases have nearly similar properties. They are all inert, colorless, odorless and do not react with any other compounds under normal conditions. The difference in melting and boiling point of these gases is very low. These gases exist as liquid in the higher temperature range. These gases are found in very less quantity in air and require large fractionation methods to purify from gas mixtures. Due to the discovery of noble gases scientists were able to know more about the atomic structure of compounds present in the earth.