Multiple Choice
Which of the following elements has 6 valence electrons?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following is the best method to determine the number of valence electrons for a main-group element using the periodic table?
A
Multiply the group number by two to get the number of valence electrons.
B
Use the period number to determine the number of valence electrons.
C
Count the number of electrons in the outermost shell, which corresponds to the group number for groups 1, 2, and 13–18.
D
Subtract the atomic number from the mass number to find the number of valence electrons.
Verified step by step guidance1
Understand that valence electrons are the electrons in the outermost shell (energy level) of an atom and are important for chemical bonding.
Recognize that for main-group elements (groups 1, 2, and 13–18), the group number corresponds to the number of valence electrons. For example, group 1 elements have 1 valence electron, group 2 have 2, and groups 13–18 have 3 to 8 valence electrons respectively.
Note that the period number indicates the principal energy level (shell) but does not directly give the number of valence electrons.
Understand that multiplying the group number by two or subtracting atomic number from mass number are not valid methods to find valence electrons.
Therefore, the best method is to count the number of electrons in the outermost shell, which corresponds to the group number for main-group elements.
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