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Where are the valence electrons located in an atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons do halogen elements have in their outermost shell?
A
8
B
6
C
5
D
7
검증된 단계별 안내1
Identify the group number of halogen elements in the periodic table. Halogens are located in Group 17 (or Group VIIA in older notation).
Recall that the group number for main-group elements corresponds to the number of valence electrons in their outermost shell.
Since halogens are in Group 17, they have 7 valence electrons in their outermost shell.
Understand that valence electrons are the electrons involved in chemical bonding and determine the chemical properties of the element.
Therefore, halogen elements have 7 valence electrons in their outermost shell.
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