Na+ is isoelectronic with:
Correct answer: D. Ne
- A. Mg
- B. He
- C. Fe
- D. Ne
Explanation
Isoelectronic species have the same number of electrons. In this case, Na+ has 10 electrons after losing one to become an ion. Among the options, only Neon (Ne) also has 10 electrons, making it isoelectronic with Na+. Mg, He, and Fe have different electron counts, so they are not isoelectronic with Na+.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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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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