Al3+ is isoelectronic with neon with 10 electrons
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Aluminium (Al3+) has a similar electron configuration to the noble gas neon (Ne). Both Al3+ and Ne have a full outer electron shell, making them stable and unreactive.
None. However, the noble gas helium is isoelectronic with Li+ ion (and not with Li element)
How would Mg change to gain a noble gas structure?
Yes, the electron structure of a zinc ion (Zn2+) achieves a pseudo noble gas configuration by losing two electrons to have a full outer shell, similar to a noble gas configuration. This stable electron configuration is in line with the octet rule, making it an example of pseudo noble gas formation.
Barium, a group 2 metal, would lose two electrons to achieve a stable noble gas structure like xenon. This would result in a full valence shell and stability, similar to a noble gas atom.
Calcium and magnesium ions have electron configurations similar to that of neon, fluorine ions are similar to that of the noble gas neon, and iodine ions are similar to the noble gas xenon.