객관식
How do valence electrons determine the reaction between sodium and chlorine?
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Valence Electrons of Elements
객관식
How many valence electrons does fluorine have?
A
6
B
7
C
8
D
5
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검증된 단계별 안내1
Identify the element in question, which is fluorine (F).
Recall that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Determine the electron configuration of fluorine: Fluorine has an atomic number of 9, so its electrons are arranged as 1s\^2 2s\^2 2p\^5.
Focus on the outermost shell, which is the second shell (n=2), containing the 2s and 2p electrons.
Count the electrons in the 2s and 2p orbitals: 2 electrons in 2s and 5 electrons in 2p, totaling 7 valence electrons.
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