SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A student incorrectly wrote the following electron configuration for fluorine as: 1s22s22p4How is this electron configuration for fluorine incorrect?
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It is incorrect because in the 1s orbital, there should be 1 electron instead of 2.
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It is incorrect because in the 2s orbital, there should be 3 electrons instead of 2.
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It is incorrect because in the 2p orbital, there should be 5 electrons instead of 4.
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It is incorrect because there should be an additional 3s level containing 2 electrons.
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Explanation:
Detailed explanation-1: -In the given, electronic configuration, 1 s 0 2 s 2 2 p 4, the orbital here has zero electrons, which clearly violates the Aufbau principle, which says that before filling up higher orbitals, lower ones must be filled first.
Detailed explanation-2: -On the other hand, fluorine has seven valence electrons, as shown by its configuration 1s2 2s2 2p5. This places it in the halogen family.
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