Chemical Elements 118

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Element ▲ Symbol Atomic number Chemical property Origin o the name Group Period Atomic weight (u)
Phosphorus P 15 Reactive nonmetal the Greek phoosphoros, 'carrying light' 15 3 30.973762
Platinum Pt 78 Transition metal the Spanish platina, meaning 'little silver' 10 6 195.084
Plutonium Pu 94 Actinide Pluto, a dwarf planet in the Solar System (then considered the ninth planet) 7
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
Potassium K 19 Alkali metal New Latin potassa, 'potash' (kalium in Latin) 1 4 39.0983
Praseodymium Pr 59 Lan­thanide the Greek praseios didymos meaning 'green twin' 6 140.90766
Promethium Pm 61 Lan­thanide Prometheus of Greek mythology who stole fire from the Gods and gave it to humans 6
Protactinium Pa 91 Actinide the Greek protos, 'first', and actinium, which is produced through the radioactive decay of protactinium 7 231.03588
Radium Ra 88 Alkaline earth metal the Latin radius, 'ray' 2 7
Radon Rn 86 Noble gas From radium, as it was first detected as an emission from radium during radioactive decay 18 6
Rhenium Re 75 Transition metal Rhenus, the Latin name for the river Rhine 7 6 186.207
Rhodium Rh 45 Transition metal the Greek rhodos, meaning 'rose coloured' 9 5 102.9055
Roentgenium Rg 111 Unknown chemical properties Wilhelm Conrad Röntgen, physicist 11 7
Rubidium Rb 37 Alkali metal the Latin rubidus, 'deep red' 1 5 85.4678
Ruthenium Ru 44 Transition metal Ruthenia, the New Latin name for Russia 8 5 101.07
Rutherfordium Rf 104 Transition metal Ernest Rutherford, chemist and physicist 4 7
Samarium Sm 62 Lan­thanide Samarskite, the name of the mineral from which it was first isolated 6 150.36
Scandium Sc 21 Transition metal Scandia, the Latin name for Scandinavia 3 4 44.955908
Seaborgium Sg 106 Transition metal Glenn T. Seaborg, scientist 6 7
Selenium Se 34 Reactive nonmetal the Greek selene, 'moon' 16 4 78.971
Silicon Si 14 Metalloid from the Latin silex, 'flint' (originally silicium) 14 3 28.085
Silver Ag 47 Transition metal English word (argentum in Latin) 11 5 107.8682
Sodium Na 11 Alkali metal the English word soda (natrium in Latin) 1 3 22.989769
Strontium Sr 38 Alkaline earth metal Strontian, a small town in Scotland 2 5 87.62
Sulfur S 16 Reactive nonmetal the Latin sulphur, 'fire and brimstone' 16 3 32.06