Atomic number: 97

Symbol: Bk

Category: actinide 

Density at 25°C: solid: density: 13.25 to 14.78 g·cm−3

This radioactive synthetic element is mainly of scientific interest due to it's difficulty in synthesis and overall stability. A little over a gram of berkelium has been produced in the United States since 1967.  It is used as a step towards making heavier elements.

Use, natural applications or common combinations: 

  • used for creating further actinides or heavier elements

Basic characteristics:

  • Standard atomic weight: (247)
  • Melting point:  986 °C
  • Boiling point:  uncertain
  • Radioactivity: all radioactive
    • 249Bk with half life of 330 days producing alpha and beta particles but turns into more radioactive 249Cf and 245Am
    • 247Bk with half life of 1380 y producing only alpa particles