Answer: There are 3 unpaired electrons on aluminium in aluminium oxide.
Explanation:
Chemical formula of aluminium oxide is \(Al_{2}O_{3}\).
The atomic number of aluminium is 13 and its electronic configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}\). In order to complete its octet, aluminium will lose or donate 3 electrons to the oxygen atom as it has 3 electrons in excess.
Thus, there are three unpaired electrons on one aluminium atom.
Since, there are two aluminium atoms in \(Al_{2}O_{3}\), so, there will be in total 6 unpaired electrons on two aluminium atoms. Whereas each oxygen atom has deficiency of 2 electrons so, each aluminium atom will donate its excess of electrons to each oxygen atom.
