객관식
Which of the following sets of elements all have exactly one valence electron (simplified main-group rule)?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
Multiple Choice
How many valence electrons does a chlorine atom (Cl) have?
A
7
B
1
C
6
D
8
검증된 단계별 안내1
Identify the group number of chlorine (Cl) in the periodic table. Chlorine is in Group 17, also known as the halogens.
Recall that the group number for main-group elements corresponds to the number of valence electrons for that element.
Since chlorine is in Group 17, it has 7 valence electrons.
Understand that valence electrons are the electrons in the outermost shell of an atom and are important for chemical bonding.
Therefore, chlorine has 7 valence electrons, which explains its chemical reactivity and tendency to gain one electron to complete its octet.
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