Multiple Choice
Which statement correctly describes the structure of an atom?
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2. Atoms & Elements
The Atom
Multiple Choice
An atom has a mass number of 27 and 14 neutrons. What is the atomic number of this atom?
A
41
B
13
C
27
D
14
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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 (atomic number, Z) and neutrons (N): \(A = Z + N\).
Identify the given values: mass number \(A = 27\) and number of neutrons \(N = 14\).
Rearrange the formula to solve for the atomic number (number of protons): \(Z = A - N\).
Substitute the known values into the equation: \(Z = 27 - 14\).
Calculate the result to find the atomic number, which represents the number of protons in the atom.
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