Correct option is A
The correct answer is: (A). Helium
Helium (He) is a monatomic molecule, meaning it exists as individual atoms in nature. It does not form diatomic molecules because it has a stable electron configuration on its own.
Why other options are incorrect:
- Nitrogen (N₂): Nitrogen naturally exists as a diatomic molecule (N₂) because it forms a stable bond between two nitrogen atoms.
- Hydrogen (H₂): Hydrogen also exists as a diatomic molecule (H₂), where two hydrogen atoms bond to form a stable molecule.
- Chlorine (Cl₂): Chlorine exists as a diatomic molecule (Cl₂), where two chlorine atoms are bonded together.
Thus, Helium is the only element among the options that does not naturally exist as a diatomic molecule.
Some key facts about Helium:
- It is a noble gas and the second lightest element in the periodic table, after hydrogen.
- Atomic number: 2
- Atomic weight: 4.0026 u
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