Multiple Choice
Which of the following elements has exactly two electron shells?
1
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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
Arsenic is a metalloid. How many valence electrons does arsenic have?
A
6
B
3
C
5
D
8
Verified step by step guidance1
Identify the group number of arsenic (As) in the periodic table. Arsenic is in group 15 (or group V) of the periodic table.
Recall that elements in group 15 have 5 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 that participate in chemical bonding.
Confirm that arsenic, being in group 15, has 5 valence electrons, which explains its chemical behavior and bonding patterns.
Therefore, the number of valence electrons in arsenic is 5.
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