Rh Rhodium 45 102.9055 9 5 d 45 1966.0 3727.0 [Kr] 4d8 5s1 2 8 18 16 1 12.4 7E-8% Silver Cubic: Face centered 2.3 1.56 {"1":"719.7","2":"1740","3":"2997"} 720 109.7 135 +3,4,6 1.34 8.3 21.76 495.39 0.242 150.0 0 Solid, Paramagnetic, Conductor, TransitionMetal, Metal, Stable, Natural RO-di-em Hard, silvery-white metal Used as a coating to prevent wear on high quality science equipment and with platinum to make thermocouples. Obtained as a by-product of nickel production. n0BM5KZBTZQ Rhodium

Greek historian Olympiodorus of Thebes roasted arsenic sulfide and obtained white arsenic during 5th century AD.

Albertus Magnus is believed to have been the first to isolate the element from a compound in 1250, by heating soap together with arsenic trisulfide.

In 1649, Johann Schröder published two ways of preparing arsenic. From the Latin word arsenicum, Greek arsenikon 45 1803 William Hyde Wollaston England From the Greek word "rhodon" meaning "rose"

Arsenic and its compounds are poisonous

Prawns are known to contain quite high levels of arsenic

The toxicity of arsenic to insects, bacteria and fungi led to its use as a wood preservative and as insecticides.

Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot.

Gallium arsenide is a semiconductor used in laser diodes and LEDs.

Small amounts of arsenic can be used in lead alloys for ammunition.