Super-heavy elements with an atomic number of 101 and higher are called the transfermium elements. All of these elements are synthetic, having been created artificially in laboratories. All are radioactive with very short half-lives.

When the creation of a new element is reported, it is given a provisional (systematic) name and a three-letter atomic symbol. These serve as a temporary placeholder name and symbol. When the discovery of a new element is independently verified, the International Union of Pure and Applied Chemistry (IUPAC) approves a permanent name and atomic symbol. Recently, the formal names and atomic symbols of two new elements have been approved by the IUPAC, replacing the provisional names. An older Periodic Table of Elements may not reflect these changes.

110 Darmstadtium Ds (formerly Ununnilium, Uun)

The first report of the synthesis of this element was made in 1987. Subsequent claims were reported in 1991, 1994, 1995, and 1998. The name Darmstadtium for element 110 was approved on August 16, 2003. It is named after the city of Darmstadt, Germany, where it was synthesized. The atomic symbol for Darmstadtium is Ds. Only a few atoms of Darmstadtium have ever been made.

111 Roentgenium Rg (formally Unununium, Uuu)

Three atoms of this element were first created in 1994. The name Roentgenium for element 111 was approved on November 1, 2004. It is named after the German physicist Wilhelm Konrad Röntgen who discovered X-rays in 1895. The atomic symbol for Roentgenium is Rg.

Note: The Periodic Table of Elements poster included with the Science 3 Manipulative Kit lists the former provisional name for element 111.

113 Ununtrium Uut

115 Ununpentium Uup

The synthesis of elements 113 and 115 was reported in February 2004. Only four atoms of each element were created (the four atoms of element 115 decayed into four atoms of element 113). Japanese scientists also announced the synthesis of elements 113 and 115 in 2004. Russian scientists confirmed the synthesis of elements 113 and 115 in May of 2006. These elements have not been confirmed by the IUPAC.

117 Ununseptium Uus

This element is unknown and has not been synthesized.

118 Ununoctium Uuo

Scientists at the Lawrence Berkeley National Laboratory in Berkeley, California, announced the synthesis of element 118 in 1999. This claim was retracted in 2000 after several attempts to reproduce the results of the experiment were unsuccessful. In 2002, the director of Lawrence Berkeley National Laboratory announced that the original claim was based on fabricated data.

A team of Russian and American scientists announced the synthesis of 3 atoms of element 118 on October 9, 2006. This element has not been confirmed by the IUPAC.

Note: The Periodic Table of Elements poster included with the Science 3 Manipulative Kit does not list any transfermium elements beyond element 112, Ununbium.