sentence: Scandium is a metal in a group known as the transition metals.
sentences_after: It is also a rare earth metal. What this means is that there is not very much scandium found in the earth. Because of this, the pure metal can be expensive. The pure metal is very reactive, and will react with other elements like oxygen. The metal turns from shiny to gray.
concept_name: scandium
headings: Scandium
categories: chemical elements metals Transition metals