Multiple Choice
Arsenic is a metalloid. How many valence electrons does arsenic have?
10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following is the best way to determine the number of valence electrons in a main-group element?
A
By looking at the element's group number on the periodic table (for groups 1, 2, and 13–18)
B
By identifying the number of protons in the nucleus
C
By subtracting the atomic number from the mass number
D
By counting the total number of electrons in the atom
Verified step by step guidance1
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Recall that for main-group elements (those in groups 1, 2, and 13–18), the group number on the periodic table corresponds directly to the number of valence electrons.
Note that the number of protons (atomic number) tells you the total positive charge in the nucleus but does not directly indicate valence electrons.
Recognize that subtracting the atomic number from the mass number gives the number of neutrons, which is unrelated to valence electrons.
Understand that counting the total number of electrons gives the total electrons in the atom, not just the valence electrons, so it is not the best method.
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