1. Berkelium (Bk), Dubnium (Db), and Hassium (Hs) were named after Berkeley, CA, Dubna, Russia and the German state of Hessen, respectively, where these man-made elements were created.
2. Temporarily known as ununseptium, because it has 117 protons in its nucleus, it was made at the Joint Institute for Nuclear Research in Dubna by smashing calcium ions into berkelium atoms.
3. Temporarily known as ununseptium, because it has 117 protons in its nucleus, it was made at the Joint Institute for Nuclear Research in Dubna by smashing calcium ions into berkelium atoms.
