InterviewSolution
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InterviewSolution
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What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. `F^(Θ)`, `Ar` ,`Mg^(2+)`,`Rb^(+)` |
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Answer» Atoms and ions having the same number of electrons are called isoelectronic species. (i) `F^(-)` ion has 9 + 1 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are `Na^(+)` ion (11 – 1 = 10 electrons), Ne (10 electrons), `O^(2-)` ion (8 + 2 = 10 electrons), and `Al^(3+)` ion (13 – 3 = 10 electrons). (ii) Ar has 18 electrons. Thus, the species isoelectronic with it will also have 18 electrons. Some of its isoelectronic species are `S^(2-)` ion (16 + 2 = 18 electrons),` Cl^(-)` ion (17 + 1 = 18 electrons), `K^(+ )` ion (19 – 1 = 18 electrons), and `Ca^(2+)` ion (20 – 2 = 18 electrons). (iii) `Mg^(2+)` ion has 12 – 2 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are `F^(-)` ion (9 + 1 = 10 electrons), Ne (10 electrons), `O^(2-)` ion (8 + 2 = 10 electrons), and `Al^(3+)` ion (13 – 3 = 10 electrons). (iv) `Rb^(+)` ion has 37 – 1 = 36 electrons. Thus, the species isoelectronic with it will also have 36 electrons. Some of its isoelectronic species are `Br^(-)` ion (35 + 1 = 36 electrons), Kr (36 electrons), and `Sr^(2+)` ion (38 – 2 = 36 electrons). |
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