Question

Noble gases are group of elements which exhibit very:
A.High chemical activity
B.Much paramagnetic properties
C.Minimum electronegativity
D.Low chemical activity

Answer 1

Hint: We need to know what are noble gases and the properties they possess. Noble gases are a class of chemical monoatomic elements. The six naturally occurring noble gases are helium, neon, argon, krypton, xenon, and the radioactive radon and belong to Group 18 of the periodic table. They are also known as inert gases and the atomic radius of each element increases as we go down the group as the number of electrons increases.

Complete answer:
We must remember that the noble gas, as the name suggests means stable but reacts in certain extreme conditions. The properties of the noble gases can be explained well by their atomic structure based on the distribution of electrons. The electrons in the valence outermost shell are full and hence stable which gives them very little tendency to participate in chemical reactions. The octet rule formulated for the distribution of electrons in various shells of an electrons concluded an octet of electrons, i.e. eight electrons in the outermost shell of an atom gave the most stable arrangement for that atom. This distribution of electrons caused them to be unreactive with other elements since they did not require electrons to complete the octet of their valence shell. Thus, it can be concluded that noble gases have low chemical activity.
Hence, the correct option is option (D).

Note:
We must remember that the noble gases have fully occupied valence shells. The valence outermost electrons of an atom are usually the electrons that take part in chemical bonding. Atoms which have fully occupied outer shells are extremely stable and therefore do not participate in chemical bonds as well as lose or gain electrons.