darmstadtium

noun Chemistry, Physics.

1. a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Ds; atomic number: 110.

Ds

1. A synthetic radioactive element, first produced by bombarding lead atoms with nickel atoms. It has a mass number of 281, and its most stable isotope has a half-life of over one minute. Atomic number 110. See Periodic Table.