Multiple Choice
Which of the following determines the type of element that an atom is?
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2. Atoms & Elements
The Atom
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Which of the following is the number of protons in a lead (Pb) atom?
A
74
B
207
C
82
D
126
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: lead (Pb). Look up the atomic number of lead on the periodic table.
The atomic number corresponds to the number of protons in the nucleus of the atom.
Note that the other numbers given (74, 207, 126) represent either atomic numbers of other elements or mass numbers, which include protons and neutrons.
Conclude that the correct number of protons in a lead (Pb) atom is the atomic number of lead, which is 82.
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