Which of the following ions is isoelectronic with neon? [\(_3\)Li, \(_9\)F, \(_{10}\)Ne, \(_{17}\)CI,\(_{19}\)K ]
Neon has electronic configuration of 2,8
\(_3\)Li\(^+\) has electronic configuration of 2 (because the + sign shows it has given out one electron from the initial 2, 1, and now has 2 with only one shell)
\(_9\)F\(^-\) has electronic configuration of 2, 8 (because the - sign shows it has accepted one electron and now the initial 2, 7, now becomes 2,8 with only 2 shells)
\(_{17}\)CI\(^-\) has electronic configuration of 2,8,8 (because the - sign shows it has accepted one electron and now the initial 2,8, 7,now becomes 2,8,8 with only 3 shells)
\(_{19}\)K\(^+\) has electronic configuration of 2,8,8(because the - sign shows it has given out one electron and now the initial 2,8,8,1 now becomes 2,8,8 with only 3 shells)
Among all the options above, the only one that has the same number of electrons (Isoelectronic) with Neon (2,8) is \(_9\)F\(^-\) (2,8)
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