Multiple Choice
What are the electrons in an atom's outermost energy level called?
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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 chlorine (Cl) atom have?
A
1
B
5
C
8
D
7
Verified step by step guidance1
Identify the element in question, which is chlorine (Cl).
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of chlorine: Cl has an atomic number of 17, so its electrons are arranged as 1s\^2 2s\^2 2p\^6 3s\^2 3p\^5.
Focus on the outermost shell, which is the third shell (3s and 3p orbitals). Count the electrons in these orbitals: 3s\^2 (2 electrons) + 3p\^5 (5 electrons) = 7 valence electrons.
Conclude that chlorine has 7 valence electrons based on its electron configuration.
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