Multiple Choice
How many valence electrons does an atom of aluminum (Al) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which element has 3 valence electrons and 3 energy levels?
A
Lithium (Li)
B
Aluminum (Al)
C
Sodium (Na)
D
Boron (B)
Verified step by step guidance1
Understand that the number of valence electrons corresponds to the group number for main-group elements. Elements with 3 valence electrons are typically in group 13 of the periodic table.
Recognize that the number of energy levels (or electron shells) corresponds to the period number of the element in the periodic table.
Identify the element with 3 valence electrons and 3 energy levels by looking at the periodic table: it should be in group 13 and period 3.
Check each option: Lithium (Li) is in period 2 with 1 valence electron; Sodium (Na) is in period 3 but has 1 valence electron; Boron (B) is in period 2 with 3 valence electrons; Aluminum (Al) is in period 3 with 3 valence electrons.
Conclude that Aluminum (Al) is the element that has 3 valence electrons and 3 energy levels.
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