Question -
Answer -
Atoms and ions having the same number of electrons arecalled isoelectronic species.
(i)┬аFтАУ┬аion has 9 + 1 = 10 electrons. Thus, thespecies isoelectronic with it will also have 10 electrons. Some of itsisoelectronic species are Na+┬аion (11 тАУ 1 = 10 electrons), Ne (10electrons), O2тАУ┬аion (8 + 2 = 10 electrons), and Al3+┬аion (13 тАУ 3 = 10 electrons).
(ii)┬аAr has 18electrons. Thus, the species isoelectronic with it will also have 18 electrons.Some of its isoelectronic species are S2тАУ┬аion(16 + 2 = 18 electrons), ClтАУ┬аion (17 + 1 = 18 electrons), K+┬аion (19 тАУ 1 = 18 electrons), and Ca2+┬аion (20 тАУ 2 = 18 electrons).
(iii)┬аMg2+┬аion has 12 тАУ 2 = 10 electrons. Thus, thespecies isoelectronic with it will also have 10 electrons. Some of itsisoelectronic species are FтАУ┬аion (9 + 1 = 10 electrons), Ne (10electrons), O2тАУ┬аion (8 + 2 = 10 electrons), and Al3+┬аion (13 тАУ 3 = 10 electrons).
(iv)┬аRb+┬аion has 37 тАУ 1 = 36 electrons. Thus, thespecies isoelectronic with it will also have 36 electrons. Some of itsisoelectronic species are BrтАУ┬аion (35 + 1 = 36 electrons), Kr (36electrons), and Sr2+┬аion (38 тАУ 2 = 36 electrons).