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Which electrons in an atom are primarily responsible for participating in chemical bonding?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a fluorine atom have?
A
8
B
5
C
7
D
6
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Identify the atomic number of fluorine, which is 9. This means a fluorine atom has 9 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of fluorine: 1s\^2 2s\^2 2p\^5.
Recognize that the first shell (1s) is full with 2 electrons, and the second shell contains the remaining electrons (2s\^2 2p\^5).
Count the electrons in the outermost shell (second shell): 2 (from 2s) + 5 (from 2p) = 7 valence electrons.
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