How reactive rutherfordium is?

Answer 1

The chemistry of rutherfordium is practically unknown; the electronegativity was not calculated. It is supposed that Rf has similar chemical properties as Zr and Hf.

Compounds as RfBr4, RfCl4, RfOCl2, K2RfCl6, etc. are known today.

Answer 2

The chemistry of rutherfordium is now only in an incipiennt phase; compounds with chlorine and bromine are known and some others. The electronegativity of Rf was not calculated.