Multiple Choice
The atomic number of oxygen is 8. What is the mass number of an oxygen atom with 7 neutrons?
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2. Atoms & Elements
The Atom
Multiple Choice
An atom has a mass number of 48 and contains 22 neutrons. How many protons does this atom have?
A
22
B
70
C
48
D
26
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Verified step by step guidance1
Recall that the mass number (A) of an atom is the sum of the number of protons (Z) and neutrons (N): \(A = Z + N\).
You are given the mass number \(A = 48\) and the number of neutrons \(N = 22\).
Rearrange the formula to solve for the number of protons: \(Z = A - N\).
Substitute the known values into the equation: \(Z = 48 - 22\).
Calculate the result to find the number of protons in the atom.
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