Sb Antimony 51 121.76 15 5 p 51 631.0 1950.0 [Kr] 4d10 5s2 5p3 2 8 18 18 5 6.69 0.00002% Silver Rhombohedral 2.1 1.984 {"1":"834","2":"1594.9","3":"2440","4":"4260","5":"5400","6":"10400"} 834 103.2 138 +3,5 1.59 18.4 19.83 67.97 0.207 24.3 0 Solid, Diamagnetic, Conductor, Metal, Stable, Natural, Metalloid AN-teh-MOH-ni Hard, brittle, silvery-white semimetal. It is alloyed with other metals to increase their hardness. Also in the manufacture of a few special types of semiconductor devices. Also in plastics and chemicals. A few kinds of over-the-counter cold and flu remedies use antimony compounds. Found in stibnite (Sb2S3) and in valentinite (Sb2O3). kcc6qNT3BoU Antimony

In 1787, Carl Axel Arrhenius found a new mineral near Ytterby in Sweden and named it ytterbite, after the village.

Johan Gadolin discovered yttrium's oxide in Arrhenius' sample in 1789, and Anders Gustaf Ekeberg named the new oxide yttria.

Elemental yttrium was first isolated in 1828 by Friedrich Wöhler. Named after Ytterby, a village in Sweden near Vauxholm 51 From the Greek words "anti + monos" meaning "not alone" (the origin of the symbol Sb comes from the Latin word "stibium")

Exposure to yttrium compounds in humans may cause lung disease

Finely divided yttrium is very unstable in air

Yttrium is often used in alloys, increasing the strength of aluminum and magnesium alloys.

Yttrium is one of the elements used to make the red color in CRT televisions.

It is also used as a deoxidizer for non-ferrous metals such as vanadium.

Yttrium can be used in laser systems and as a catalyst for ethylene polymerization reactions.