Which diatomic arrangement includes hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine?

• A. Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
• B. Helium, Neon, Argon
• C. Hydrogen, Neon, Oxygen
• D. Hydrogen, Carbon, Nitrogen

Answer: (A)

Two atoms bonded together form a diatomic molecule. Under normal conditions, seven elements naturally exist as diatomic molecules: hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. They are commonly represented as H2, N2, O2, F2, Cl2, Br2, and I2. The other options mix in elements that aren’t diatomic in everyday conditions—for example, noble gases like helium, neon, and argon exist as single atoms, and carbon typically forms solids or larger molecules rather than a diatomic gas. So this arrangement includes exactly the elements that form diatomic molecules.