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Explanation:

Step1: Determine atomic number of aluminum

Aluminum (Al) has an atomic number of 13, so it has 13 electrons.

Step2: Fill 1s orbital

The 1s orbital can hold 2 electrons. According to the Pauli - exclusion principle, the two electrons in 1s have opposite spins. So we put 2 electrons in the 1s box with opposite spins (↑↓).

Step3: Fill 2s orbital

The 2s orbital can also hold 2 electrons. We put 2 electrons in the 2s box with opposite spins (↑↓).

Step4: Fill 2p orbitals

The 2p sub - shell has 3 orbitals and can hold a total of 6 electrons. We fill the 2p orbitals one electron at a time (Hund's rule) before pairing them up. So we put 6 electrons in the 2p orbitals as ↑↓ ↑↓ ↑↓.

Step5: Fill 3s orbital

The 3s orbital can hold 2 electrons. We put 2 electrons in the 3s box with opposite spins (↑↓).

Step6: Fill 3p orbitals

After filling 1s, 2s, 2p and 3s, we have used 2 + 2+6 + 2=12 electrons. The remaining 1 electron goes into the 3p orbitals. According to Hund's rule, we put this single electron in one of the 3p orbitals with spin up (↑).

The orbital diagram for aluminum will have the 1s box with ↑↓, 2s box with ↑↓, 2p boxes with ↑↓ ↑↓ ↑↓, 3s box with ↑↓ and one of the 3p boxes with ↑.

Answer:

1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑ (with the other two 3p boxes empty)