Multiple Choice
In which orbitals are the valence electrons of selenium (Se) located?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has the same number of valence electrons as aluminum?
A
Sodium (Na)
B
Chlorine (Cl)
C
Oxygen (O)
D
Boron (B)
Verified step by step guidance1
Identify the group number of aluminum (Al) in the periodic table. Aluminum is in group 13, which means it has 3 valence electrons.
Recall that elements in the same group of the periodic table have the same number of valence electrons because they share similar chemical properties.
Check the valence electrons of each given element by locating their group numbers: Sodium (Na) is in group 1, Chlorine (Cl) is in group 17, Oxygen (O) is in group 16, and Boron (B) is in group 13.
Compare the valence electrons of each element to aluminum's 3 valence electrons. Only elements in group 13 will have 3 valence electrons like aluminum.
Conclude that Boron (B), being in group 13, has the same number of valence electrons as aluminum, which explains why it is the correct answer.
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