Multiple Choice
How many valence (outer-shell) electrons does the element carbon (C) have?
1
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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Lithium (Li) is in Group 1 of the periodic table. How many valence electrons does lithium have?
A
3
B
8
C
1
D
2
Verified step by step guidance1
Identify the group number of lithium in the periodic table. Lithium is in Group 1.
Recall that elements in Group 1 have 1 valence electron because the group number corresponds to the number of valence electrons for main-group elements.
Understand that valence electrons are the electrons in the outermost shell of an atom, which determine chemical reactivity.
Confirm that lithium's electron configuration is 1s\^2 2s\^1, showing one electron in the outermost shell (2s).
Conclude that lithium has 1 valence electron based on its group and electron configuration.
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