Question

Noble gas molecules are diatomic.
A. True
B. False

Answer 1

Noble gases are the element present in group 18 of the periodic table. The noble gases contain a total of eight electrons in the valence electron configuration. Due to this they attain stability.

Complete step by step answer:
-Atomicity is defined as the number of atoms present in a molecule. On the basis of atomicity, the molecules are divided into monoatomic, diatomic, triatomic.
-When a molecule is composed of only one atom, then the molecule is known as monatomic.
-When a molecule is composed of two atoms, then the molecule is known as diatomic.
-When a molecule is composed of three atoms, then the molecule is known as triatomic.
-Noble gases are group 18 elements which are present far right in the periodic table. The noble gases are inert in nature as they follow octet rule containing 8 electrons in their valence shell electronic configuration. Due to their stable nature noble gases are highly unreactive and do not react with any other atom or molecule to give chemical reaction.
-The elements present in group 18 are helium, neon, argon, krypton, xenon, radon.
-All the elements contain 8 electrons in their valence shell and form a stable atom thus not reacting with other elements to form diatomic molecules.
-Thus, the statement noble gas molecules are diatomic is not true.
Therefore, the correct option is B.

Note:
Noble gases are colorless non-flammable gases odourless under standard conditions. The noble gases are arranged according to their boiling point in the periodic table.