One or more chemical elements' physical forms that exist in the same physical state are referred to as allotropes.
There may be variations in the chemical and physical characteristics of allotropes.
The Greek term allotropia, which signifies changeability, is where the word "allotropy" originates.
Properties:
Allotropes are multiple structural forms of the same element, and as a result, they can display varied physical and chemical characteristics.
The same factors that affect other structures—light, pressure, and temperature—also affect allotropic forms.
The stability of the various allotropes thus depends on particular circumstances.
The two allotropes of Carbon, Diamond, and Graphite, differ in terms of their appearances, hardness ratings, melting temperatures, boiling points, and reactivities.
Some elements have several solid allotropes but just one liquid and gas form.