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Which of the following best describes the significance of valence electrons in an atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in a neutral atom of fluorine?
A
1
B
5
C
8
D
7
Guida verificata passo dopo passo1
Identify the element in question, which is fluorine (F).
Determine the atomic number of fluorine, which is 9, meaning it has 9 electrons in a neutral atom.
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$.
Count the electrons in the outermost shell (the second shell), which includes the \$2s^2$ and \$2p^5$ electrons, totaling 7 valence electrons.
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