Multiple Choice
For a nitrogen atom (atomic number 7), how many electrons are present in its outermost shell?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons does a fluorine atom (F) have?
A
8
B
5
C
7
D
6
Verified step by step guidance1
Identify the atomic number of fluorine (F), 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. The first shell (1s) is full with 2 electrons, and the second shell contains the remaining electrons.
Count the electrons in the outermost shell (the second shell), which includes the 2s and 2p orbitals: 2 electrons in 2s and 5 electrons in 2p, totaling 7 valence electrons.
Conclude that fluorine has 7 valence electrons because these are the electrons available for bonding and chemical reactions.
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