Question

What is the category of aluminium on the periodic table? What is its phase?

Answer 1

Chemical elements were arranged in the periodic table according to their atomic numbers. The elements that belong to group $13$ are known as the boron family. Aluminium is the element with atomic number $13$ that belongs to the boron family. Phase is nothing but in which the elements exist at room temperature.

Complete answer:
The modern periodic table is the representation of chemical elements in the increasing order of atomic numbers. The elements were arranged in vertical columns and horizontal rows. The vertical columns were known as groups and the horizontal rows were known as periods. There are a total of $7$ periods and $18$ groups.
The element that belongs to group number $13$ is known as aluminium, it belongs to the boron family. The elements in the boron family are boron, aluminium, gallium, indium, and thallium. The valence electrons of chemical elements that belong to the boron family are $3$ and the outer electronic configuration can be written as $n{s^2}n{p^1}$ .
The chemical symbol of aluminium is $Al$ . It is a metal, which can undergo loss of electrons and exists as a cation in the formation of chemical compounds. At room temperature, aluminium exists as a solid.
Thus, the category of aluminium is a metal on the periodic table and the phase is solid.

Note:
The elements in the periodic table were arranged in blocks, namely s, p, d, and f blocks. The d-block elements are known as transition elements except for Zinc, cadmium, and mercury. As aluminium is a p-block element, it can also be known as a post-transition element.