객관식
Which property determines an atom's identity as the element phosphorus?
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2. Atoms & Elements
Atomic Mass
Multiple Choice
An atom of iodine contains 75 neutrons. What is its mass number?
A
128
B
53
C
75
D
127
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검증된 단계별 안내1
Recall that the mass number of an atom is the total number of protons and neutrons in its nucleus.
Identify the number of neutrons given in the problem, which is 75.
Determine the atomic number of iodine, which is the number of protons. For iodine, the atomic number is 53.
Use the formula for mass number: \(\text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons}\).
Substitute the values: \(\text{Mass Number} = 53 + 75\) to find the mass number.
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