Which of the following are isoelectronic species ?
Correct answer: D. F- Ne Na+
- A. H+ H H-
- B. Li+ Na+ K+
- C. C1- Br- I
- D. F- Ne Na+
Explanation
Isoelectronic species have the same number of electrons. F- has 9 + 1 = 10 electrons, Ne has 10 electrons, and Na+ has 11 - 1 = 10 electrons. Students may choose b because Li+, Na+ and K+ are all cations, but they have 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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