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How is the energy level of an atom's valence electrons related to its period in the periodic table?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons are present in a neutral atom of fluorine?
A
5
B
7
C
8
D
6
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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. This means a neutral fluorine atom has 9 electrons.
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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