Multiple Choice
How many valence electrons does the element lead (Pb) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has 6 valence electrons?
A
Nitrogen (N)
B
Carbon (C)
C
Oxygen (O)
D
Fluorine (F)
Verified step by step guidance1
Recall that the number of valence electrons for main-group elements corresponds to the group number in the periodic table (for groups 1, 2, and 13-18).
Identify the group number for each element: Nitrogen (N) is in group 15, Carbon (C) is in group 14, Oxygen (O) is in group 16, and Fluorine (F) is in group 17.
Understand that the group number minus 10 gives the number of valence electrons for groups 13-18. For example, group 16 elements have 6 valence electrons because 16 - 10 = 6.
Apply this to Oxygen (O), which is in group 16, so it has 6 valence electrons.
Verify that Nitrogen (5 valence electrons), Carbon (4 valence electrons), and Fluorine (7 valence electrons) do not have 6 valence electrons, confirming Oxygen as the correct answer.
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