Multiple Choice
An atom has 15 total electrons. How many electrons does it have in its outer (valence) shell?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which region of the periodic table contains atoms with the greatest number of valence electrons?
A
Group 18 (noble gases)
B
Group 1 (alkali metals)
C
Group 17 (halogens)
D
Group 2 (alkaline earth metals)
Verified step by step guidance1
Understand that valence electrons are the electrons in the outermost shell of an atom and determine its chemical properties.
Recall that the number of valence electrons corresponds to the group number for main-group elements in the periodic table.
Identify the valence electrons for each group: Group 1 has 1 valence electron, Group 2 has 2, Group 17 has 7, and Group 18 has 8 valence electrons (except helium, which has 2).
Recognize that atoms with the greatest number of valence electrons are those in Group 18, the noble gases, because they have a full outer shell.
Conclude that Group 18 contains atoms with the greatest number of valence electrons among the given options.
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