Question

by taking this checkpoint, you will check your understanding of the concepts youve been working on in this lesson. you may take the checkpoint multiple times. only your highest score will be recorded in the gradebook. if you scored poorly the first time, go back and review the lesson activities you struggled with before taking the checkpoint again. ask your teacher for assistance if you need extra help. good luck! note: to answer some of the questions, it may help to reference a periodic fable. what is the unit used to measure the weighted average mass of isotopes?
○ atomic mass unit
○ mass number unit
○ atomic number unit
○ oxidation number unit
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Explanation:

To determine the unit for the weighted average mass of isotopes, we analyze each option:

• "atomic mass unit (amu)" is defined as a unit to express the mass of atoms and isotopes, specifically for the weighted average mass of isotopes (average atomic mass).
• "mass number unit" is incorrect as mass number is a count of protons and neutrons, not a unit of mass.
• "atomic number unit" is incorrect since atomic number is the number of protons, not a mass unit.
• "oxidation number unit" is incorrect as oxidation number is about electron transfer in reactions, not mass.

Answer:

A. atomic mass unit