"What does it mean to have a element that is isoelectronic? One of my
practice questions asks me to "identify the neutral element that is
isoelectronic with the cation Po^4+". I'm totally stumped."
Isoelectronic means that the neutral element and cation have the same
electron configuration. For instance, Na+ has is isoelectronic with the
element Neon, because when Na looses one electron (and becomes Na+) it takes
on the electronic configuration of the element that normally has one less
electron. Remember, Na has 11 electrons, and Ne has 10. Na+ has 10
electrons.
Po 4+ will be four less than Po on the periodic table in terms of electron
number.
Hope this helps,
Mike KL5
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