Multiple Choice
What is the mass number for an atom of xenon containing 54 protons and 76 neutrons?
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2. Atoms & Elements
The Atom
Multiple 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
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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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