|Part of Speech:||n|
|Definition:||a synthetic chemical element, element 110 of the periodic chart (Ds) in the same group as nickel, palladium, and platinum|
|Etymology:||1984; formerly ununnilium or Eka-Platinum|
|darmstadtium (därm'shtät'ē-əm) Pronunciation Key
A synthetic radioactive element, first produced by bombarding lead atoms with nickel atoms. The isotope first synthesized has a mass number of 269 and a half-life of 0.18 milliseconds. Atomic number 110. See Periodic Table.