Jeffersonium, bibiennium (Bbe), or dvi-moscovium is the hypothetical chemical element with the symbol Jf and the atomic number 229. It is named after Thomas Jefferson and this is post-transition metal in pnictogen group (9p3 coordinate) below Joulium (J), 169 element. Jeffersonium under normal conditions is a colored radioactive metal. Like all chemical elements with an atomic number greater than 82, Jeffersonium has no stable isotopes. The most stable of these, 707Jf, has a half-life of about 1.7 seconds. There is not much to say about it.
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