The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
Correct answer: A. 7
- A. 7
- B. 10
- C. 12
- D. 16
Explanation
A p-subshell has three orbitals, so according to Hund's rule its maximum unpaired electrons occur at p3, as in nitrogen: 1s2 2s2 2p3. Nitrogen has atomic number 7. Students may choose d because sulfur also has unpaired p electrons, but its p4 arrangement has only 2 unpaired electrons, not the maximum of 3.
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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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