Isoelectronic [ENDORSED]

[Hellen Truong 2J]

Are Be2+ and Li+ considered isoelectronic to F-?

[Nisarg Shah 1C]

No. F- gains 1 more valence electron and would have a complete octet, making it isoelectronic to the next noble gas (Ne). Be2+ and Li+ are isoelectronic to He, because they lose their 2s electrons.

[Kevin Ru 1D]

Remember that atoms or ions are considered isoelectronic only when they have both the same number of valence electrons and the same electronic structure. Hope that helps!

[Michelle Lu 1F]

No, Be2+ and Li+ would actually be isoelectronic to He since Be would be losing 2 and Li would be losing 1 electron. In order to be isoelectronic, Be2+, Li+, and Ne would have to have the same number of electrons. For example, Na+ and Mg2+ would be isoelectronic to Ne.

[Wayland Leung]

Are elements isoelectronic if they have the same number of valence electrons but different structure?