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Atomic structure (hydrogen): Which of the following is NOT an isotope of hydrogen? Recall the three isotopes of hydrogen and identify the odd one out. Choose the correct option.

Difficulty: Easy

Protium
Deuterium
Tritium
Hydronium (H3O+)

Correct Answer: Hydronium (H3O+)

Explanation:

What is being asked?
Pick the option that is not a hydrogen isotope.

Given data

Hydrogen isotopes: protium (¹H), deuterium (²H or D), tritium (³H or T)

Concept/Approach
Hydronium is a polyatomic ion (H₃O⁺) formed when H⁺ associates with water; it is not an isotope (same element with different mass numbers).

Final Answer
Hydronium (H₃O⁺)

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