Multiple Choice
How many electrons are present in a neutral calcium atom?
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2. Atoms & Elements
The Atom
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How many protons are present in an atom of bismuth?
A
209
B
65
C
83
D
126
Verified step by step guidance1
Identify the element in question, which is bismuth. Each element is defined by its atomic number, which corresponds to 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.
Understand that the atomic mass (such as 209) represents the total number of protons and neutrons, but the number of protons is given by the atomic number, not the atomic mass.
Look up bismuth on the periodic table to find its atomic number, which directly tells you the number of protons in a bismuth atom.
Conclude that the number of protons in a bismuth atom is equal to its atomic number, which is the correct answer.
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