Multiple Choice
Which statement best describes a neutral atom?
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4. Atoms and Elements
The Atom (Simplified)
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How many protons are in a neutral atom of bismuth (Bi)?
A
56
B
209
C
126
D
83
Verified step by step guidance1
Identify the element in question, which is bismuth (Bi). Each element is defined by its atomic number, which represents the number of protons in its nucleus.
Recall that the atomic number is unique to each element and can be found on the periodic table. For bismuth, find its atomic number by locating it on the periodic table.
Understand that in a neutral atom, the number of protons equals the number of electrons, but the question specifically asks for protons, so focus on the atomic number.
Note that the atomic mass (such as 209) represents the total number of protons and neutrons, not just protons, so it is not the correct answer for the number of protons.
Conclude that the number of protons in a neutral atom of bismuth is equal to its atomic number, which is 83.
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