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558px-Electron shell 111 Roentgenium svg.jpg

Roentgenium (pronounced /rɛntˈɡɛniəm/ or /rʌntˈdʒɛniəm/ ) is a chemical element in the periodic table that has the symbol Rg and atomic number 111.

It is a synthetic element whose most stable known isotope has a mass of 283 amu and an estimated half-life of ten minutes.


Roentgenium is found as a milky white powder in the form of Roentgenium triflouride, although current extraction techniques requires the discarding of the flourine.

Element 111 is the ninth member of the 6d series of transition metals and the heaviest member of group 11 (IB) in the Periodic Table, below copper, silver, and gold. Each of the members of this group show different stable states. Copper forms a stable +II state, whilst silver is predominantly found as Ag(I) and gold as Au(III). Copper(I) and silver(II) are also relatively well-known. Roentgenium predominantly forms a stable +III state, although it is also somewhat common in a stable +II state.The heavier members of this group are well known for their lack of reactivity or noble character. Silver and gold are both inert to oxygen. They are both however attacked by the halogens. In addition, silver is attacked by sulfur and hydrogen sulfide, highlighting its higher reactivity compared to gold. Roentgenium is even more noble than gold and is inert to oxygen and halogens. The most common reaction is with flourine to form a trifluoride, RgF3.


The base value of each unit of ranges between 40 and 100Ð per unit, with up to 2 units being found at any one time.

Presence on Mars: Very Rare

Martian Minerals
Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6
Group 5 |Americium | Anthraximite | Areanetium Dieinsteinium | Areanetium Ferrocrete | Areanetium Mendelite | Berkelium | Bohrium | |Californium | Curium | Darmstadtium | Einsteinium | Fermium | Fermium Hasside | Ferro-plat Alloy | Hassium | Lawrencium | |Meitnerium | Meitnerium Golgathide | Mendelevium | Neptunium | Nobelium | Plutonium | Roentgenium | Seaborgium | |Transuranic Alloblast |