객관식
Which term best describes the negatively charged particles located in the outermost energy levels of an atom's electron cloud?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
객관식
How many valence electrons does a fluorine atom have?
A
8
B
6
C
5
D
7
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검증된 단계별 안내1
Identify the element in question, which is fluorine (F).
Determine the atomic number of fluorine, which is 9, meaning it has 9 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of fluorine: \$1s^2 2s^2 2p^5$.
Count the electrons in the outermost shell (the second shell): \$2s^2$ and \$2p^5$ add up to \(2 + 5 = 7\) valence electrons.
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