Thorium

Example:Water and most construction materials are nonradioactive compared to elements like thorium and uranium.

Definition:Not emitting radiation, particularly beta or gamma rays. Nonradioactive materials are stable and do not undergo nuclear decay.

Example:While metals like thorium are metallic, carbon and other nonmetallic elements are unique in their properties and uses.

Definition:Not having the characteristics or properties of a metal. Nonmetallic elements, such as carbon and silicon, are distinguished by their conductivity and other properties.

Example:There are many elements that would be considered nonmetallic, opposite of having metallic properties like thorium.

Definition:Categorized or classified within a particular group. In this context, the opposite of thorium as a metallic element.