Americium is a radioactive element, which does not occur naturally on earth. Therefore it needs to be produced artificially. It was named after the Americas, because it was discovered in America and in the periodic table it is positioned right below europium.

There is no picture of the corresponding element, yet. Urano and Pluton, the rulers of the underworld, are trying to make new monsters through nuclear fusion. They need new monsters to build a clone army in order to take over the world. Unfortunately these experiments fail regularely.

The name is a combination of the greek prefix proto ("first" or "before", "original") and the element actinium, because it is the precursor of actinium in the so called decay chain of uranium.

The name actinium comes from the greek word aktis meaning "ray", because it generates radioactive rays and glows in the dark. It is name patron for a whole group of elements: the actinides. Because of its strong radioactivity there are only a few very special applications for it.

Uranium is a dangerous metal. Before it was known for it’s radioactivity, people used it to die glass green. It is mostly used for atomic energy and atomic bombs. His name patron Uranus is named after the god of the sky and the father of all gods in Greek mythology.

Urano the monster wants to be the ruler over all the Elemonsters world. He believes that he’s entitled to it, for his name to begin with. He tries to reach this goal by any means. Be it by creating new monsters with nuclear fusion to form a clone army.