Multiple Choice
An atom has a mass number of 27 and 14 neutrons. What is the atomic number of this atom?
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2. Atoms & Elements
The Atom
Multiple Choice
Which of the following is the number of protons found in an atom of iodine?
A
127
B
53
C
74
D
80
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Verified step by step guidance1
Recall that the number of protons in an atom is given by its atomic number, which is unique to each element.
Identify the element in question, which is iodine in this problem.
Look up the atomic number of iodine on the periodic table; this number represents the number of protons in an iodine atom.
Understand that the atomic mass (such as 127) represents the total number of protons and neutrons, not just protons.
Conclude that the correct number of protons in an iodine atom corresponds to its atomic number, which is 53.
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