Multiple Choice
What is the approximate atomic mass (in atomic mass units, u) of an atom that contains 26 protons and 30 neutrons?
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2. Atoms & Elements
Atomic Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is the atomic mass of gold (Au)?
A
118.71 u
B
107.87 u
C
196.97 u
D
63.55 u
Verified step by step guidance1
Understand that the atomic mass of an element is the weighted average mass of the isotopes of that element, measured in atomic mass units (u).
Recognize that gold (Au) is a well-known element with a specific atomic mass listed on the periodic table.
Recall or look up the atomic mass of gold (Au) on the periodic table, which is approximately 196.97 u.
Compare the given options to the known atomic mass of gold to identify the correct value.
Confirm that 196.97 u matches the known atomic mass of gold, while the other values correspond to different elements.
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