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#chemistry
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#science
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Consider the following ions and choose the one that is not isoelectronic with noble gas.
1. S²-
2. Ba+
3. Al³+
4. Sb³-
5. Sc³+?
The ion that is not isoelectronic with a noble gas is Ba+ (barium ion). The other ions listed are isoelectronic with noble gases, with the same number of electrons as a noble gas atom.