Hydrogen atomic weight is

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Multiple Choice

Hydrogen atomic weight is

Explanation:
Atomic weight reflects the weighted average mass of all of an element’s isotopes, not the mass of a single atom. For hydrogen, the most common isotope is protium, which has 1 proton and no neutrons, giving a mass close to 1 atomic mass unit. There are small amounts of deuterium (mass about 2) and tritium (mass about 3), and when these are averaged in, the overall atomic weight lands near 1.008 amu. So, hydrogen’s atomic weight is about 1, rather than 2, 3, or 4. In practice, we round to 1 for quick reference.

Atomic weight reflects the weighted average mass of all of an element’s isotopes, not the mass of a single atom. For hydrogen, the most common isotope is protium, which has 1 proton and no neutrons, giving a mass close to 1 atomic mass unit. There are small amounts of deuterium (mass about 2) and tritium (mass about 3), and when these are averaged in, the overall atomic weight lands near 1.008 amu. So, hydrogen’s atomic weight is about 1, rather than 2, 3, or 4. In practice, we round to 1 for quick reference.

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