Multiple Choice
To fill the valence shell, an electrically neutral, unbonded atom with atomic number 8 must add how many electrons?
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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
5
B
7
C
6
D
8
Verified step by step guidance1
Identify the group number of chlorine (Cl) in the periodic table. Chlorine is in Group 17 (also known as Group VIIA).
Recall that elements in Group 17 have 7 valence electrons because the group number corresponds to the number of valence electrons for main-group elements.
Understand that valence electrons are the electrons in the outermost shell of an atom, which participate in chemical bonding.
Confirm that chlorine's electron configuration ends in 3s^2 3p^5, indicating 2 electrons in the 3s subshell and 5 electrons in the 3p subshell, totaling 7 valence electrons.
Conclude that chlorine has 7 valence electrons based on its group number and electron configuration.
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