electronic arrangement of an aluminium ion

The electronic arrangement of an aluminium ion (Al³⁺) is as follows:

Step 1: Identify the atomic number of aluminium. The atomic number of aluminium is 13, which means a neutral aluminium atom has 13 electrons.

Step 2: Write down the electron configuration of a neutral aluminium atom. The electron configuration of aluminium is 2,8,3. This means there are 2 electrons in the first energy level (K shell), 8 in the second (L shell), and 3 in the third (M shell).

Step 3: Determine the charge of the aluminium ion. The charge of an aluminium ion is +3 (Al³⁺), which means it has lost 3 electrons.

Step 4: Subtract the number of lost electrons from the total number of electrons in the neutral atom. 13 (total electrons) - 3 (lost electrons) = 10 electrons.

Step 5: Write down the electron configuration of the aluminium ion. After losing 3 electrons, all from the third energy level, the electron configuration of an aluminium ion is 2,8. This means there are 2 electrons in the first energy level and 8 in the second.