Question
Aluminium forms the ion $\mathrm{Al}^{3+}$, but not $\mathrm{Al}^{4+}$ why?
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Answer
Aluminium ( $[\mathrm{Ne}]^{3 \mathrm{~s}^2} 3 \mathrm{p}^{\prime}$ can achien the electronic configuration of the nearest noble gas ( Ne ) by losing only three electrons. : $\mathrm{Al}^{3+}=1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^6$. Aluminium with not form the $\mathrm{Al}^{4+}$ ion because an extremely high amount of energy would be required to remove an electron from the stable noble gas configuration.
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