Multiple Choice
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d8?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which one of the following species has the electron configuration 1s22s22p6?
A
O2-
B
Na+
C
F-
Verified step by step guidance1
Identify the total number of electrons in each species to determine their electron configurations.
Recall that the electron configuration 1s\^22s\^22p\^6 corresponds to a total of 10 electrons, which is the electron configuration of the noble gas neon (Ne).
Calculate the number of electrons for each species: O\^{2-} has 8 (oxygen) + 2 (extra electrons) = 10 electrons; Na\^{+} has 11 (sodium) - 1 (lost electron) = 10 electrons; F\^{-} has 9 (fluorine) + 1 (extra electron) = 10 electrons.
Since all three species have 10 electrons, they all share the electron configuration 1s\^22s\^22p\^6, which is the electron configuration of neon.
Therefore, each species O\^{2-}, Na\^{+}, and F\^{-} has the electron configuration 1s\^22s\^22p\^6.
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