Multiple Choice
In mass spectrometry, which of the following best describes a molecular ion?
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2. Atoms & Elements
The Atom
Multiple Choice
An atom has a mass number of 30 and contains 16 neutrons. What is the atomic number of this atom?
A
46
B
14
C
30
D
16
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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: the mass number \(A = 30\) and the number of neutrons \(N = 16\).
Rearrange the formula to solve for the atomic number (number of protons): \(Z = A - N\).
Substitute the known values into the equation: \(Z = 30 - 16\).
Calculate the difference to find the atomic number, which represents the number of protons in the atom.
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