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Option 2 : Carbon
The correct answer is Carbon.
- Atomic weight:
- It also called relative atomic mass, is the ratio of the total weight of the atoms of a chemical substance to a norm.
- The normal unit of atomic mass has been one-twelfth of the atomic mass of the carbon-12 isotope since 1961.
- Atomic weight is measured in units of atomic mass (usually abbreviated to AMU), also known as Daltons.
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