Among the following which elements have the same atomicity?

Explanation:

Atomicity refers to the number of atoms in a molecule of an element.

• Hydrogen (H₂): Diatomic, meaning it has 2 atoms per molecule.
• Helium (He): Monatomic, as it exists as a single atom.
• Oxygen (O₂): Diatomic, with 2 atoms per molecule.

Since both Hydrogen and Oxygen are diatomic, they have the same atomicity.

Final Answer

The correct answer is Both A & C (Hydrogen and Oxygen).