erbium
Erbium is a chemical element, its chemical symbol is Er, its atomic number is 68, belongs to the lanthanide element, is also one of rare earth elements. In 1843, discovered by C.G.Morander. He originally named erbium oxide as terbium oxide, so in the early German literature, terbium oxide and erbium oxide were mixed. Until 1860, only to be corrected. The first ionization energy is 6.10 electron volts. And holmium, dysprosium chemical properties and physical properties are almost identical. Silver gray metal, soft, insoluble in water, soluble in acid. Salts and oxides are pink to red. Erbium isotopes are: 162Er, 164Er, 166Er, 167Er, 168Er, 170Er. Exist in igneous rocks. Can be electrolytic melting erbium chloride ErCl3 obtained. The oxide Er2O3 is rose red and is used to make pottery glaze. ...