Multiple Choice
How many electrons does a neutral atom of titanium contain?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of aluminum?
A
11
B
27
C
13
D
14
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Verified step by step guidance1
Recall that the number of protons in an atom is given by its atomic number, which uniquely identifies the element.
Identify the element in question, which is aluminum in this problem.
Look up the atomic number of aluminum on the periodic table; this number represents the number of protons.
Understand that the atomic mass (such as 27) represents the total number of protons and neutrons, not just protons.
Conclude that the number of protons in an aluminum atom is equal to its atomic number, which is 13.
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