QUICK REFERENCE Symbol: Og Atomic Number: 118 Atomic Weight: [294] Element Classification: Noble Gas Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Livermore National Laboratory (California, USA) Discovery Date: 2002 Name Origin: Named after Yuri Oganessian, a prominent Russian nuclear physicist who contributed to the discovery of superheavy elements Density(g/cc): Estimated to...

QUICK REFERENCE Symbol: Ts Atomic Number: 117 Atomic Weight: [294] Element Classification: Halogen Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Oak Ridge National Laboratory (Tennessee, USA) Discovery Date: 2010 Name Origin: Named after the state of Tennessee, reflecting the collaboration with Oak Ridge National Laboratory Density(g/cc): Estimated to be around 7.2 (predicted)...

QUICK REFERENCE Symbol: Lv Atomic Number: 116 Atomic Weight: [293] Element Classification: Post-transition Metal Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Livermore National Laboratory (California, USA) Discovery Date: 2000 Name Origin: Named after the Lawrence Livermore National Laboratory and the city of Livermore, California Density(g/cc): Estimated to be around 12.9 (predicted)...

QUICK REFERENCE Symbol: Mc Atomic Number: 115 Atomic Weight: [290] Element Classification: Post-transition Metal Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Livermore National Laboratory (California, USA) Discovery Date: 2003 Name Origin: Named after the Moscow Oblast, where the Joint Institute for Nuclear Research is located Density(g/cc): Estimated to be around 13.5...

QUICK REFERENCE Symbol: Fl Atomic Number: 114 Atomic Weight: [289] Element Classification: Post-transition Metal Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Livermore National Laboratory (California, USA) Discovery Date: 1998 Name Origin: Named after the Flerov Laboratory of Nuclear Reactions where superheavy elements are studied, itself named after Soviet physicist Georgy Flyorov...

QUICK REFERENCE Symbol: Nh Atomic Number: 113 Atomic Weight: [286] Element Classification: Post-transition Metal Discovered By: Joint team from RIKEN (The Institute of Physical and Chemical Research) in Japan, and the Joint Institute for Nuclear Research in Dubna, Russia Discovery Date: 2004 Name Origin: Named after the Japanese word ‘Nihon’, meaning Japan Density(g/cc): Estimated to...

QUICK REFERENCE Symbol: Cn Atomic Number: 112 Atomic Weight: [285] Element Classification: Transition Metal, though it exhibits properties of a noble gas Discovered By: Society for Heavy Ion Research (GSI) in Darmstadt, Germany Discovery Date: 1996 Name Origin: Named after Nicolaus Copernicus, the Renaissance astronomer who proposed the heliocentric model of the solar system Density(g/cc):...

QUICK REFERENCE Symbol: Rg Atomic Number: 111 Atomic Weight: [282] Element Classification: Transition Metal Discovered By: Society for Heavy Ion Research (GSI) in Darmstadt, Germany Discovery Date: 1994 Name Origin: Named after Wilhelm Conrad Röntgen, the discoverer of X-rays Density(g/cc): Estimated to be around 28.7 (predicted) Melting Point: Unknown Boiling Point: Unknown Appearance: Presumed to...

QUICK REFERENCE Symbol: Ds Atomic Number: 110 Atomic Weight: [281] Element Classification: Transition Metal Discovered By: Society for Heavy Ion Research (GSI) in Darmstadt, Germany Discovery Date: 1994 Name Origin: Named after the city of Darmstadt, Germany, where it was discovered Density(g/cc): Estimated to be around 34.8 (predicted) Melting Point: Unknown Boiling Point: Unknown Appearance:...

QUICK REFERENCE Symbol: Mt Atomic Number: 109 Atomic Weight: [278] Element Classification: Transition Metal, though its exact classification is uncertain due to its radioactive nature and limited experiments. Discovered By: Peter Armbruster, Gottfried Münzenberg, and the team at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany Discovery Date: 1982 Name Origin: Named after Lise Meitner,...

QUICK REFERENCE Symbol: Hs Atomic Number: 108 Atomic Weight: [269] Element Classification: Transition Metal Discovered By: Peter Armbruster, Gottfried Münzenberg, and the team at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany Discovery Date: 1984 Name Origin: Named after the German state of Hesse (Latin: “Hassias”), where the discovering laboratory is located Density(g/cc): Estimated to...

QUICK REFERENCE Symbol: Bh Atomic Number: 107 Atomic Weight: [270] Element Classification: Transition Metal Discovered By: Peter Armbruster, Gottfried Münzenberg, and their team at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany Discovery Date: 1981 Name Origin: Named after Niels Bohr, the Danish physicist who made foundational contributions to understanding atomic structure and quantum theory...

QUICK REFERENCE Symbol: Sg Atomic Number: 106 Atomic Weight: [269] Element Classification: Transition Metal Discovered By: Lawrence Berkeley National Laboratory team Discovery Date: 1974 Name Origin: Named after Glenn T. Seaborg, a Nobel laureate and pioneer in nuclear chemistry Density(g/cc): Estimated to be around 35.0 (predicted) Melting Point: Unknown Boiling Point: Unknown Appearance: Presumed to...

QUICK REFERENCE Symbol: Db Atomic Number: 105 Atomic Weight: [268] Element Classification: Transition Metal Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Berkeley National Laboratory (Berkeley, USA) Discovery Date: Competing claims in the late 1960s and early 1970s Name Origin: Named after the city of Dubna, Russia, home to the Joint Institute...

QUICK REFERENCE Symbol: Rf Atomic Number: 104 Atomic Weight: [267] Element Classification: Transition Metal Discovered By: Joint Institute for Nuclear Research (Dubna, Russia) and Lawrence Berkeley National Laboratory (Berkeley, USA) Discovery Date: Claimed in 1964 by Dubna and in 1969 by Berkeley Name Origin: Named after Ernest Rutherford, the New Zealand-born physicist known for his...

QUICK REFERENCE Symbol: Lr Atomic Number: 103 Atomic Weight: [266] Element Classification: Actinide Discovered By: Lawrence Berkeley National Laboratory team led by Albert Ghiorso Discovery Date: 1961 Name Origin: Named after Ernest O. Lawrence, inventor of the cyclotron Density(g/cc): Estimated to be around 15.6 (predicted) Melting Point: 1627°C (estimated) Boiling Point: Not determined Appearance: Presumed...

QUICK REFERENCE Symbol: No Atomic Number: 102 Atomic Weight: [259] Element Classification: Actinide Discovered By: Joint Institute for Nuclear Research (Dubna) and Lawrence Berkeley National Laboratory Discovery Date: Claimed in 1957 by Swedish scientists; conclusively identified in 1966 Name Origin: Named after Alfred Nobel, the inventor of dynamite and founder of the Nobel Prize Density(g/cc):...

QUICK REFERENCE Symbol: Md Atomic Number: 101 Atomic Weight: [258] Element Classification: Actinide Discovered By: Albert Ghiorso, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, and Stanley G. Thompson Discovery Date: 1955 Name Origin: Named after Dmitri Mendeleev, the creator of the periodic table Density(g/cc): Not well determined; estimated around 10.3 (predicted) Melting Point:...

QUICK REFERENCE Symbol: Fm Atomic Number: 100 Atomic Weight: [257] Element Classification: Actinide Discovered By: Albert Ghiorso and the Lawrence Berkeley National Laboratory team Discovery Date: 1952 Name Origin: Named after Enrico Fermi, renowned physicist Density(g/cc): Not well determined; estimated around 9.7 Melting Point: 1527°C (estimated) Boiling Point: Not determined Appearance: Presumed to be a...

QUICK REFERENCE Symbol: Es Atomic Number: 99 Atomic Weight: [252] Element Classification: Actinide Discovered By: Albert Ghiorso and the Lawrence Berkeley National Laboratory team Discovery Date: 1952 Name Origin: Named after Albert Einstein Density(g/cc): 8.84 (estimated) Melting Point: 860°C (estimated) Boiling Point: Not determined Appearance: Silver-colored, radioactive metal (appearance is theoretical due to its extreme...