Multiple Choice
What is the mass number for an atom of xenon containing 54 protons and 76 neutrons?
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Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The atomic number of boron is 5. What is the mass number of a boron atom that contains 4 neutrons?
A
11
B
4
C
9
D
5
Verified step by step guidance1
Recall that the atomic number (Z) represents the number of protons in an atom. For boron, Z = 5, meaning it has 5 protons.
Understand that the mass number (A) is the total number of protons and neutrons in the nucleus of an atom. It is given by the formula: \(A = Z + N\), where \(N\) is the number of neutrons.
Identify the number of neutrons given in the problem, which is 4.
Substitute the values into the mass number formula: \(A = 5 + 4\).
Calculate the sum to find the mass number of the boron atom.
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