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Which of the following atoms is capable of having an expanded valence shell?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in a neutral atom of neon (Ne)?
A
10
B
6
C
2
D
8
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Identify the atomic number of neon (Ne), which is 10. This means a neutral neon atom has 10 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of neon: \$1s^2 2s^2 2p^6$.
Recognize that the first shell (1s) holds 2 electrons and the second shell (2s and 2p) holds 8 electrons.
Since the outermost shell is the second shell, count the electrons in \$2s^2$ and \$2p^6$, which sum to 8 valence electrons.
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