Multiple Choice
How many valence electrons does each member of the boron family (Group 13) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an arsenic (As) atom have?
A
7
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 the group number for main group elements corresponds to the number of valence electrons. For group 15 elements, the number of valence electrons is 5.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Confirm that arsenic has 5 valence electrons by considering its electron configuration, which ends in 4s^2 3d^{10} 4p^3, where the 4s and 4p electrons are the valence electrons.
Conclude that arsenic has 5 valence electrons, which matches the correct answer choice.
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