Multiple Choice
How many valence electrons does an oxygen atom (O) 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 aluminum (Al) have?
A
1
B
2
C
8
D
3
Verified step by step guidance1
Identify the element in question, which is aluminum (Al).
Determine the atomic number of aluminum, which is 13, meaning it has 13 electrons in total.
Recall that valence electrons are the electrons in the outermost shell of an atom.
Write the electron configuration of aluminum: \$1s^2 2s^2 2p^6 3s^2 3p^1$.
Count the electrons in the outermost shell (the third shell): \$3s^2\( and \)3p^1$ add up to 3 valence electrons.
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