Which of the following ions is isoelectronic with neon? [3Li, 3F, 10Ne, 17CI,19K]

Assessment: WAEC SSCE - Chemistry - 2009 (Objective) Subject: Chemistry

Question 1 Report

Which of the following ions is isoelectronic with neon? [3Li, 3F, 10Ne, 17CI,19K]
Answer Details
The question is asking which of the given ions has the same electronic configuration as neon. Neon is a noble gas and has an electronic configuration of 1s22s22p6. Isoelectronic refers to ions or atoms that have the same number of electrons, thus the same electronic configuration. Among the given options, the ion that has the same number of electrons as neon is the one that has 10 electrons in total. Looking at the options, the only ion with 10 electrons is F-. Therefore, F- is isoelectronic with neon. Therefore, the correct option is F-.
Read lesson note on Structure Of The Atom (WAEC)
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