객관식
Which subatomic particle determines the identity of an element?
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2. Atoms & Elements
The Atom
객관식
Which of the following is the number of protons in an atom of sodium (Na)?
A
10
B
23
C
12
D
11
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검증된 단계별 안내1
Recall that the number of protons in an atom is given by its atomic number, which is unique for each element.
Identify the element in question, which is sodium (Na).
Look up the atomic number of sodium on the periodic table; this number represents the number of protons in a sodium atom.
Note that the atomic number of sodium is 11, meaning it has 11 protons.
Understand that the other numbers given (10, 23, 12) represent either the number of neutrons, the atomic mass, or are incorrect values for the number of protons.
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