Chemical Elements 118

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Element ▼ Symbol Atomic number Chemical property Origin o the name Group Period Atomic weight (u)
Scandium Sc 21 Transition metal Scandia, the Latin name for Scandinavia 3 4 44.955908
Samarium Sm 62 Lan­thanide Samarskite, the name of the mineral from which it was first isolated 6 150.36
Rutherfordium Rf 104 Transition metal Ernest Rutherford, chemist and physicist 4 7
Ruthenium Ru 44 Transition metal Ruthenia, the New Latin name for Russia 8 5 101.07
Rubidium Rb 37 Alkali metal the Latin rubidus, 'deep red' 1 5 85.4678
Roentgenium Rg 111 Unknown chemical properties Wilhelm Conrad Röntgen, physicist 11 7
Rhodium Rh 45 Transition metal the Greek rhodos, meaning 'rose coloured' 9 5 102.9055
Rhenium Re 75 Transition metal Rhenus, the Latin name for the river Rhine 7 6 186.207
Radon Rn 86 Noble gas From radium, as it was first detected as an emission from radium during radioactive decay 18 6
Radium Ra 88 Alkaline earth metal the Latin radius, 'ray' 2 7
Protactinium Pa 91 Actinide the Greek protos, 'first', and actinium, which is produced through the radioactive decay of protactinium 7 231.03588
Promethium Pm 61 Lan­thanide Prometheus of Greek mythology who stole fire from the Gods and gave it to humans 6
Praseodymium Pr 59 Lan­thanide the Greek praseios didymos meaning 'green twin' 6 140.90766
Potassium K 19 Alkali metal New Latin potassa, 'potash' (kalium in Latin) 1 4 39.0983
Polonium Po 84 Post-​transition metal Named after the home country of Marie Curie (Polonia, Latin for Poland), who is also the discoverer of Radium 16 6
Plutonium Pu 94 Actinide Pluto, a dwarf planet in the Solar System (then considered the ninth planet) 7
Platinum Pt 78 Transition metal the Spanish platina, meaning 'little silver' 10 6 195.084
Phosphorus P 15 Reactive nonmetal the Greek phoosphoros, 'carrying light' 15 3 30.973762
Palladium Pd 46 Transition metal the then recently discovered asteroid Pallas, considered a planet at the time 10 5 106.42
Oxygen O 8 Reactive nonmetal from the Greek oxy-, both 'sharp' and 'acid', and -gen, meaning 'acid-forming' 16 2 15.999
Osmium Os 76 Transition metal the Greek osmè, meaning 'smell' 8 6 190.23
Oganesson Og 118 Unknown chemical properties Yuri Oganessian, physicist 18 7
Nobelium No 102 Actinide Alfred Nobel, chemist, engineer, inventor of dynamite 7
Nitrogen N 7 Reactive nonmetal the Greek nitron and '-gen' meaning 'niter-forming' 15 2 14.007
Niobium Nb 41 Transition metal Niobe, daughter of king Tantalus from Greek mythology 5 5 92.90637