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+?

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+?