Input interpretation
roentgenium (chemical element) | mendelevium (chemical element)
Periodic table location
Periodic table location
Images
Images
Basic elemental properties
![| roentgenium | mendelevium atomic symbol | Rg | Md atomic number | 111 | 101 short electronic configuration | [Rn]7s^15f^146d^10 | [Rn]7s^25f^13 Aufbau diagram | 6d 5f 7s | 5f 7s block | d | f group | 11 | period | 7 | 7 atomic mass | 281 u | 258 u half-life | 10 min | 51.5 days](../image_source/c3212c94cf9ddfc82633d9d8a0f16709.png)
| roentgenium | mendelevium atomic symbol | Rg | Md atomic number | 111 | 101 short electronic configuration | [Rn]7s^15f^146d^10 | [Rn]7s^25f^13 Aufbau diagram | 6d 5f 7s | 5f 7s block | d | f group | 11 | period | 7 | 7 atomic mass | 281 u | 258 u half-life | 10 min | 51.5 days
Thermodynamic properties
| mendelevium melting point | 827 °C (properties at standard conditions)
Reactivity
| roentgenium | mendelevium valence | (unknown) | 3 electronegativity | | 1.3 first ionization energy | | 635 kJ/mol (kilojoules per mole) ionization energies | {} | 635 kJ/mol
Atomic properties
| roentgenium | mendelevium term symbol | ^2S_(1/2) | ^2F_(7/2) (electronic ground state properties)
Abundances
| roentgenium | mendelevium solar abundance | 0 mass% | 0 mass% meteorite abundance | 0 mass% | 0 mass% crust abundance | 0 mass% | 0 mass% ocean abundance | 0 mass% | 0 mass% human abundance | 0 mass% | 0 mass% solar molar abundance | 0 mol% | 0 mol% meteorite molar abundance | 0 mol% | 0 mol% ocean molar abundance | 0 mol% | 0 mol% crust molar abundance | 0 mol% | 0 mol% human molar abundance | 0 mol% | 0 mol%
Nuclear properties
| roentgenium | mendelevium half-life | 10 min | 51.5 days lifetime | 14.5 min | 74.3 days specific radioactivity | 2.463×10^6 TBq/g | 363.6 TBq/g decay mode | alpha emission | alpha emission nuclear spin | | Md-245: 1/2^- | Md-247: 1/2^- | Md-249: 7/2^- | Md-251: 7/2^- | Md-253: 1/2^- | Md-254: 0^- | Md-255: 7/2^- | Md-256: 1^- | Md-257: 7/2^- | Md-258: 8^- | Md-259: 7/2^- | Md-261: 7/2^- unstable isotopes | Rg-283 (10 min) | Rg-282 (200 s) | Rg-281 (60 s) | Rg-280 (10 s) | Rg-279 (3 s) | Rg-278 (1 s) | Rg-277 (1 s) | Rg-276 (100 ms) | Rg-275 (10 ms) | Rg-274 (5 ms) | Rg-273 (5 ms) | Rg-272 (2 ms) | Md-258 (51.5 days) | Md-260 (31.8 days) | Md-257 (5.53 h) | Md-259 (97 min) | Md-256 (77 min) | Md-261 (40 min) | Md-255 (27 min) | Md-254 (10 min) | Md-253 (6 min) | Md-251 (4 min) | Md-262 (200 s) | Md-252 (140 s) | Md-250 (52 s) | Md-249 (24 s) | Md-248 (7 s) | Md-247 (1.12 s) | Md-246 (1 s) | Md-245 (900 µs)
Identifiers
| roentgenium | mendelevium CAS number | 54386-24-2 | 7440-11-1