
Roentgenium (Rg) is a chemical element of the periodic table, located in the group 11 and the period 7, and has the atomic number 111. It is named after the German mechanical engineer, Wilhelm Röntgen, the discoverer of X-rays. It is a transuranium element and is counted as one of the radioactive elements.
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– d block |
FAQs on Roentgenium Element
Roentgenium |
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‣ What does roentgenium look like? Appearance: silvery (predicted) |
‣ When was roentgenium discovered and by who? Discovery: Gesellschaft für Schwerionenforschung (1994) |
‣ Location of roentgenium on the periodic table![]() Location: Roentgenium is found in the seventh row of the periodic table, next to the darmstadtium element. |
‣ What is the atomic number of roentgenium? Atomic number (Z): 111 |
‣ What is the symbol for roentgenium? Symbol: Rg |
‣ Roentgenium atomic weight: [282] (unconfirmed: 286) |
‣ Roentgenium is which block element? Block: d-block |
‣ What group is roentgenium in the periodic table? Group: 11 |
‣ What period is roentgenium on the periodic table? Period: 7 |
‣ Roentgenium atomic radius: empirical: 138 pm (predicted) |
‣ Roentgenium covalent radius: 121 pm (estimated) |
‣ How many electrons does roentgenium have? Electrons per shell: 2, 8, 18, 32, 32, 17, 2 (predicted) |
‣ What is the electron configuration for roentgenium? Electron configuration: [Rn] 5f14 6d9 7s2 (predicted) |
‣ Roentgenium ionization energies: 1st: 1020 kJ/mol 2nd: 2070 kJ/mol 3rd: 3080 kJ/mol (all estimated) |
‣ Is roentgenium a solid, liquid or gas? Phase (at r.t): solid (predicted) |
‣ Roentgenium density (near r.t): 22-24 g/cm3 (predicted) |
‣ Roentgenium natural occurrence: synthetic |
‣ Roentgenium oxidation state: (-1), (+1), (+3), (+5), (+7) (predicted) |
‣ What is the crystal structure of roentgenium? Crystal structure: body-centered cubic (bcc) (predicted) |
‣ Roentgenium CAS number: 54386-24-2 |
‣ How many isotopes does roentgenium have?
Main isotopes of roentgenium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
272Rg | syn | 2 ms | α | 268Mt |
274Rg | syn | 12 ms | α | 272Mt |
278Rg | syn | 4 ms | α | 274Mt |
279Rg | syn | 0.09 s | α | 275Mt |
280Rg | syn | 4.6 s | α | 276Mt |
281Rg | syn | 17 s | SF (90 %) α (10 %) | 277Mt |
282Rg | syn | 100 s | α | 278Mt |
283Rg | syn | 5.1 min? | SF | |
286Rg | syn | 10.7 min? | α | 282Mt |
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