What is the phenomenon where a single chemical compound exists in two or more crystalline or molecular forms with different physical properties?

💡 Solution & Explanation

Allotropy is the characteristic behavior of certain chemical elements to exist in two or more distinct physical forms within the same state of matter, such as graphite and diamond for carbon. Isomerism applies to chemical compounds sharing molecular formulas but differing in structural arrangements. Basic chemical definitions are staple concepts tested in general science sections.