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What is the total number of valence (outer) electrons present in a molecule of sulfur dioxide (SO_2)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following represents the number of valence electrons in an oxygen (O) atom?
A
4
B
2
C
8
D
6
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Recall that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Determine the atomic number of oxygen (O), which is 8, meaning it has 8 electrons in total.
Write the electron configuration of oxygen: 1s\^2 2s\^2 2p\^4.
Identify the electrons in the outermost shell (the second shell), which includes the 2s and 2p orbitals.
Count the electrons in the outermost shell: 2 (from 2s) + 4 (from 2p) = 6 valence electrons.
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