Which one has maximum number of unpaired electrons ?
Correct answer: B. 7Y
- A. 6X
- B. 7Y
- C. 9Z
- D. 13W
Explanation
The species represented by atomic number 7 has configuration 1s2 2s2 2p3, with three unpaired electrons in the three p orbitals. The likely alternative is 6X, but carbon has 1s2 2s2 2p2 and therefore only two unpaired electrons.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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