Multiple Choice
Which set correctly lists the three main subatomic particles that make up an atom?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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How many protons are in an atom of bismuth (Bi)?
A
115
B
209
C
83
D
56
Verified step by step guidance1
Identify the element in question, which is bismuth (Bi).
Recall that the number of protons in an atom is equal to the atomic number of the element.
Look up the atomic number of bismuth on the periodic table; this number is unique to each element and represents the number of protons.
Note that the atomic number of bismuth is 83, meaning it has 83 protons.
Understand that the other numbers given (115, 209, 56) could represent other properties such as mass number or neutron count, but they do not indicate the number of protons.
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