객관식
How many valence electrons are present in a neutral atom of aluminum (Al)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
객관식
How many valence electrons does an oxygen (O) atom have?
A
6
B
4
C
8
D
2
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검증된 단계별 안내1
Identify the element in question, which is oxygen (O).
Determine the atomic number of oxygen, which is 8, meaning it has 8 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of oxygen: \(1s^2\, 2s^2\, 2p^4\).
Count the electrons in the outermost shell (the second shell), which includes the \$2s^2$ and \$2p^4$ electrons, totaling 6 valence electrons.
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