An element has electronic conviguration 1s2 2s2 2p2. It belongs to__________________?
Correct answer: B. Group IV-A
- A. Group II-A
- B. Group IV-A
- C. Group VII-A
- D. Group VI-A
Explanation
The configuration 1s2 2s2 2p2 contains four valence electrons, so the element is carbon, which belongs to Group IV-A, or Group 14. The likely mistake is Group II-A because the configuration begins with 2s2, but the occupied 2p2 subshell must also be counted as part of the valence shell.
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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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