General Science • ChemistryEasy
Which of the following electronic configurations represents a noble gas element?
A. 1s^2 2s^2 2p^5
B. 1s^2 2s^2 2p^6✓ Correct Answer
C. 1s^2 2s^2 2p^6 3s^1
D. 1s^2 2s^2 2p^4
💡 Solution & Explanation
The electronic configuration 1s2 2s2 2p6 corresponds to neon, which has a total of 10 electrons and a completely filled outermost shell, satisfying the octet rule and imparting chemical inertness typical of noble gases. Options with incomplete shells, such as 1s2 2s2 2p5 which represents fluorine, are chemically reactive halogens seeking to gain an electron. Noble gases are characterized by their stable valence shell configurations, making them unreactive under standard conditions. Helium possesses the configuration 1s2, representing a duplet rather than an octet.
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