Multiple Choice
Which numerical setup can be used to determine the atomic mass of bromine, given its two naturally occurring isotopes, Br-79 (abundance: 50.69%, mass: 78.918 amu) and Br-81 (abundance: 49.31%, mass: 80.916 amu)?
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2. Atoms & Elements
Atomic Mass
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10. What is the atomic mass of copper?
A
58.93 u
B
47.87 u
C
65.39 u
D
63.55 u
Verified step by step guidance1
Understand that the atomic mass of an element is the weighted average mass of all the naturally occurring isotopes of that element, measured in atomic mass units (u).
Recognize that the atomic mass is a characteristic property of each element and can be found on the periodic table.
Locate copper (Cu) on the periodic table, which has the atomic number 29.
Read the atomic mass value listed for copper on the periodic table, which is typically given to two decimal places.
Compare the given options to the known atomic mass of copper from the periodic table to identify the correct value.
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