In 1961,the Reference for the Atomic Mass Unit (Amu or U)was

question 96

Multiple Choice

In 1961,the reference for the atomic mass unit (amu or u) was changed from naturally occurring oxygen with a value of 16.000 u to one based on a single isotope of carbon (carbon-12) .Why was it changed?

• A)The atomic composition of oxygen varies depending upon its source.
• B)Carbon-12 is more common than oxygen.
• C)Carbon exists as only one isotope, carbon-12.
• D)Carbon can combine with four atoms of hydrogen to form CH₄, methane, while oxygen only combines with two atoms of hydrogen to form water, H₂O.

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Methods or practices that align with moral principles and values, ensuring fairness, respect, and integrity in actions.

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