Why is aluminium found in period 3?

Aluminium is found in period 3 of the Periodic Table because it has an atomic number of 13, indicating that it has 13 protons in its nucleus. This places it in the third row of the periodic table, where elements have three electron shells. In terms of electron configuration, aluminium has the configuration of 1s² 2s² 2p⁶ 3s² 3p¹, reflecting its placement in period 3. Additionally, it is classified as a metal, specifically a group 13 element, due to its properties and position in the table.