Multiple Choice
How many total electrons are present in a neutral atom of carbon?
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The Atom
Multiple Choice
An ion has 108 electrons, 108 protons, and 110 neutrons. What is the mass number of this ion?
A
216
B
110
C
218
D
108
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Verified step by step guidance1
Recall that the mass number (A) of an atom or ion is the total number of protons and neutrons in its nucleus.
Identify the number of protons given in the problem: 108 protons.
Identify the number of neutrons given in the problem: 110 neutrons.
Use the formula for mass number: \(A = \text{number of protons} + \text{number of neutrons}\).
Substitute the values: \(A = 108 + 110\) to find the mass number.
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