👉 Lanthanum is a chemical element with the symbol La and atomic number 89. It is a transition metal that has distinct properties in chemistry, including being highly reactive and having unique properties as a semiconductor material. Lanthanum was first synthesized by Heinrich Franz von Lahnthal in 1852. It is commonly used in various applications due to its unique chemical reactivity and electrical conductivity. Additionally, lanthanum is often found in the mineral tanzania (