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Which part of an atom is primarily involved in chemical reactions?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does fluorine have?
A
8
B
7
C
5
D
6
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 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$.
Count the electrons in the outermost shell (the second shell), which includes the \$2s^2$ and \$2p^5$ electrons, totaling 7 valence electrons.
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