An element which can exist in two or more forms in the same physical state, exhibits

The correct term that describes an element which can exist in two or more forms in the same physical state is allotropy. Allotropy is a type of property that some elements have, where they can exist in different structural forms known as allotropes. Each allotrope has different physical and chemical properties, even though they are made up of the same atoms. For example, carbon is an element that exhibits allotropy. It can exist in several different allotropes, including diamond, graphite, and fullerenes. Diamond is a hard, transparent substance used in jewelry and cutting tools, while graphite is a soft, dark substance used in pencils and lubricants. Both diamond and graphite are made up of carbon atoms, but their structures are different, which results in their different physical and chemical properties. Isotopy refers to the property of having the same atomic number but a different atomic mass due to a different number of neutrons. Structural isomerism refers to the property of having the same chemical formula but different structural arrangements. Variable valency refers to the property of having different valences, or combining capacities, depending on the chemical reaction.