Question

The stranger gas is:
a) Ne
b) He
c) Kr
d) Xe

Answer 1

Hint: Noble gas is translated from the german noun ‘edelgas’ which indicates that their reactiveness is very low, all the noble gas at the time of discovery was known by a greek name, later all of them were also called inert gases.

Complete step by step solution:
1.) Xenon is also classified as a rare atmospheric gas, it is non- toxic tasteless, colorless, monoatomic and is chemically inert with an atomic number of 54 and atomic mass 131 units.
2.) It was discovered by Scottish chemist William Ramsay and English chemist Travers in the year 1898, well this was not their first discovery, they already discovered Argon, Neon and krypton from liquid air. They named the gas xenon for the Greek word Xenos that means ‘stranger’.
3.) Let’s know some properties of Xenon:
a) Although Xenon is unreactive, it undergoes some chemical reactions for example formation of xenon hexafluoroplatinate.
b) Naturally occurring xenon have seven stable isotopes, more than 40 isotopes undergo reactive decay, the isotopes of xenon are important for knowing the early history of the solar system.
c) Three fluorides of xenon are $Xe{{F}_{2}}$, $Xe{{F}_{4}}$, $Xe{{F}_{6}}$ with an exception of Xenon dichloride $XeC{{l}_{2}}$, the other halides are not known.

Therefore, from the above statements we can conclude that the correct answer is (d).

Note:
1.) Helium is an element with the symbol He and its atomic number 2. It is also called ‘Helios’ which means ‘sun’.
2.) Krypton is a chemical element with the symbol Kr and atomic number 36. It is also called ‘kryptos’ which means ‘the hidden one’.
3.) Neon is a chemical element with the symbol Ne and atomic number 10. It is also called ‘neos’ which means ‘new’.