Atomic weight is the relative mass of an atom of an element compared to a standard. Historically, this standard has changed.
Atomic Weight Comparison Standard
In early chemistry, the atomic weight of elements was often determined by comparing them to the atomic weight of Hydrogen. Hydrogen was assigned a relative atomic mass of 1.
This comparative method allowed scientists to establish a scale for the masses of different atoms relative to a common reference point.
While Oxygen and later Carbon-12 became the standards, Hydrogen was the initial reference element used for comparison.
Conclusion
Therefore, the atomic weight of an element is historically compared with Hydrogen to determine its atomic weight.
Correct Answer: Option C
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