Multiple Choice
Lithium (Li) is in Group 1 of the periodic table. How many valence electrons does lithium have?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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How many valence electrons does fluorine (F) have?
A
7
B
5
C
8
D
2
Verified step by step guidance1
Identify the element fluorine (F) on the periodic table. Fluorine is in group 17, also known as the halogens.
Recall that the group number for main-group elements indicates the number of valence electrons. For group 17 elements, the number of valence electrons is 7.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Confirm that fluorine has 7 valence electrons by considering its electron configuration, which ends in 2s\^2 2p\^5, totaling 7 electrons in the second shell.
Conclude that fluorine has 7 valence electrons, which explains its high reactivity and tendency to gain one electron to complete its octet.
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