Multiple Choice
Which element has two valence electrons?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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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 neutral fluorine atom have?
A
9
B
7
C
5
D
8
Verified step by step guidance1
Identify the atomic number of fluorine, which is 9. This means a neutral fluorine atom has 9 protons and 9 electrons.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of fluorine to find how electrons are distributed in its shells. The configuration is 1s\^2 2s\^2 2p\^5.
Recognize that the first shell (1s) holds 2 electrons, and the second shell (2s and 2p) holds the remaining electrons. The outermost shell is the second shell.
Count the electrons in the outermost shell: 2 electrons in 2s and 5 electrons in 2p, totaling 7 valence electrons.
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