객관식
Which of the following is true of both the sodium and chlorine atoms?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of fluorine?
A
11
B
19
C
7
D
9
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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 fluorine.
Look up the atomic number of fluorine on the periodic table; the atomic number represents the number of protons.
Note that the atomic number of fluorine is 9, meaning a neutral fluorine atom has 9 protons.
Confirm that the number of protons equals the number of electrons in a neutral atom, but the question only asks for protons.
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