Question

: Noble gas molecules are diatomic.
(A) True
(B) False

Answer 1

Hint:To see whether noble gases are diatomic or monoatomic we need to go through the properties of noble gases. Noble gases are placed in group $18$ also known as group $0$ of the periodic table. Each noble gas is placed between the most electronegative elements also known as the halogen elements $(group17)$ and the most electropositive elements or alkali elements $(group1)$.

Complete answer:There are a total of seven noble gases present in the periodic table. They are Helium, Radon, Neon, Xenon, Argon, Krypton and Oganesson. The abundance of noble gases keeps on decreasing as the atomic number increases.
We know that the valence shell of the noble gases is completely filled so they are highly stable. Because of having its octet complete and a high stability it is chemically inert or unreactive or we can say that these elements do not combine with other elements to form a compound.
As noble gases do not form compounds, hence they cannot occur in the form of diatoms.
Noble gases occur as monoatomic molecules which means that one molecule of noble gas will contain only one atom.

So, the correct answer will be Option (B) i.e. False.

Additional information: The noble gases are colorless, odorless, tasteless and non-flammable gases, the melting point and boiling points of the noble gases is very low. This property makes the noble gases really useful in the study of matter at very low temperatures.

Note:Oganesson is predicted to be a noble gas but it has still not been chemically investigated. Also, some of the noble gases do form compounds with other elements. Helium is the most abundant element except hydrogen as it has the smallest atomic number among noble gases.