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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
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How many valence electrons do halogen elements have in their outermost shell?
A
8
B
6
C
5
D
7
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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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