객관식
Which property of an atom determines the identity of a chemical element?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of aluminum?
A
13
B
27
C
11
D
14
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검증된 단계별 안내1
Recall that the number of protons in a neutral atom is equal to the atomic number of the element.
Identify the element given in the problem, which is aluminum.
Look up the atomic number of aluminum on the periodic table; this number represents the number of protons.
Understand that the atomic number is unique to each element and defines the element's identity.
Conclude that the number of protons in a neutral aluminum atom is equal to its atomic number.
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