Which of the following set has all species isoelectronic__________________?
Correct answer: C. F - Ne - Na+
- A. F - Cl - Br
- B. Li+1 - Na+1 - K+1
- C. F - Ne - Na+
- D. H+ - H- - H
Explanation
F-, Ne, and Na+ each contain 10 electrons: F- has 9 + 1 electrons, Ne has 10, and Na+ has 11 - 1 electrons. Species with the same number of electrons are isoelectronic, even though their nuclear charges differ. The likely mistake is choosing Li+, Na+, and K+ because they are all positive ions, but they contain 2, 10, and 18 electrons respectively.
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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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