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Which of the following elements is NOT Diatomic?

(A) Chlorine

(B) Argon

(C) Sulphur

(D) Helium

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 4

Option 1 -> Includes Chlorine (A), which IS diatomic (Cl₂), making this incorrect.

Option 2 -> Includes Chlorine (A), which IS diatomic (Cl₂), making this incorrect.

Option 3 -> Includes Chlorine (A), which IS diatomic (Cl₂), making this incorrect.

Option 4 -> Lists only Argon, Sulphur, and Helium - all are NOT diatomic, making this correct.


Hence, Option 4: (B), (C) and (D) only -> Chlorine exists as Cl₂ (diatomic), while Argon and Helium are noble gases existing as single atoms (Ar, He), and Sulphur exists as S₈ molecules at room temperature. Only (B), (C), and (D) are NOT diatomic -> correct

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