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The modern basis of atomic weight is...

The modern basis of atomic weight is

A

Isotope `H^(1) = 1.000`

B

Oxygen `= 16.000`

C

Isotope `O^(16) = 16.000`

D

Isotope `C^(12) = 12.000`

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Atomic Weight:** - Atomic weight (or atomic mass) is a measure of how heavy an atom is compared to a standard reference atom. 2. **Identifying the Reference Standard:** - The modern basis for atomic weight is defined relative to the isotope of carbon known as Carbon-12 (C-12). 3. **Definition of Atomic Weight:** - Atomic weight is defined as the ratio of the average mass of an atom to 1/12th of the mass of a Carbon-12 atom. This means that the atomic weight of an element indicates how many times heavier an atom of that element is compared to 1/12th of a Carbon-12 atom. 4. **Conclusion:** - Therefore, the modern basis of atomic weight is Carbon-12, making it the standard reference for measuring atomic masses of all other elements. **Final Answer:** The modern basis of atomic weight is Carbon-12. ---
**Step-by-Step Solution:** 1. **Understanding Atomic Weight:** - Atomic weight (or atomic mass) is a measure of how heavy an atom is compared to a standard reference atom. 2. **Identifying the Reference Standard:** - The modern basis for atomic weight is defined relative to the isotope of carbon known as Carbon-12 (C-12). ...
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