How hard is roentgenium?

Roentgenium, a synthetic element with the symbol Rg and atomic number 111, is highly unstable and has a very short half-life, making it difficult to study its physical properties, including hardness. Due to its position in the Periodic Table, it is expected to have properties similar to those of gold and platinum, suggesting it may be relatively soft. However, definitive measurements of its hardness have not been conducted due to the element's extreme rarity and instability.