Why it is not possible to remove or add more than three electrons in a atom?

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I am not sure it is safe to say "it is not possible" to add or remove more than three electrons from an atom.  For example you can have the compound

Tin(IV) phosphate.  In this form, the tin has a +4 ionic charge and therefore has loss 4 electrons.

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I am not sure it is safe to say "it is not possible" to add or remove more than three electrons from an atom.  For example you can have the compound

Tin(IV) phosphate.  In this form, the tin has a +4 ionic charge and therefore has loss 4 electrons.

I think it would be better to say that representative elements tend to lose electrons that move down to the closest noble gas configuration (metals) or gain electrons to move up to the next closest noble gas (nonmetals).  For most representative elements, due to their location in the periodic table, do not need to gain or lose more than three electrons to accomplish this.

One could also argue that the energy required to remove (or add) each subsequent electron is more than the previous one and eventually the energy required to remove the electrons are not compensated for by the energy released when forming the new ionic compound and thus for energy reasons we do not see the loss, or gain, of more than three electrons for well behaved representative elements.

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