Roentgenium chemical symbol
roentgenium, chemical, element, metal, atom, synthetic, transition, periodic, group, atomic, number, mass, density, melting, boiling, radioactive, isotope, compound, reaction, bonding, electron, valence, stability, configuration, decay, half life, nucleus, transactinide, superheavy, artificial, nuclear, chemistry, laboratory, research, discovery, environment, structure, chemicalprocess, properties, applications