Multiple Choice
Which of the following are the very small particles that make up matter?
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2. Atoms & Elements
The Atom
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the mass number for an atom of xenon containing 54 protons and 75 neutrons?
A
54
B
19
C
75
D
129
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Verified step by step guidance1
Identify the number of protons and neutrons given in the problem. Here, the atom has 54 protons and 75 neutrons.
Recall that the mass number (A) of an atom is the total number of protons and neutrons in its nucleus.
Write the formula for the mass number: \(A = Z + N\), where \(Z\) is the number of protons and \(N\) is the number of neutrons.
Substitute the given values into the formula: \(A = 54 + 75\).
Add the numbers to find the mass number, which represents the total nucleons in the atom.
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