Why is aluminium considered a p-block element?

Aluminium is considered a p-block element because its outermost electron enters the p-orbital of its valence shell. In the modern periodic table, elements are classified into blocks based on the type of atomic orbital receiving the last electron.

The atomic number of aluminium is 13, and its electronic configuration is 1s² 2s² 2p⁶ 3s² 3p¹. Since the last electron of aluminium is present in the 3p orbital, it belongs to the p-block of the periodic table.

Aluminium is placed in Group 13 and Period 3 along with other p-block elements. It shows properties such as metallic behaviour, formation of compounds, and a common oxidation state of +3. Studying aluminium as a p-block element helps students understand periodic classification, electronic configuration, and the relationship between atomic structure and chemical properties.