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Gallium was an element whose existence was predicted by Mendeleev in 1871 He predicted that the then unknown element gallium should resemble aluminum in its properties He suggested that the name ekaaluminium He predicted that the element would have an atomic mass of 68 its formula would be Ea2O3 the gravity would be 59 and that it would be discovered spectroscopically All these properties were very accurate to Galliums which I will explain later on In the 1800s French Chemist Paul-Emile Lecoq de Boisbaurdan 1838-19120 set out to find the metals that were missing in Mendeleeves table in between aluminum and indium and found Gallium in 1875 He suspected that he was on the right track when he discovered new spectral lines from samples of the zinc mineral sphalerite Sphalerite a zinc sulfide mineral which was once called galena inanis useless lead This included many metallic impurities including gallium Months later he isolated the pure element by electrolyzing a mixture of hydroxide and potassium hydroxide Gallium is a soft metal It is the only metal except for mercury caesium and rubidium which can be liquid near room temperatures This makes it possible to use in high-temperature thermometers It has one of the longest liquid ranges of any metal and has a low vapor pressure even at high temperatures Pure gallium has a beautiful silvery appearance The metal expands on solidifying therefore it should not be stored in glass or metal containers as they may break as the metal solidifies High-purity gallium is attacked only slowly by mineral acids Gallium arsenide is capable of converting electricity directly into coherent light and gallium arsenide is a key component of LEDs light emitting diodes Gallium is a soft blue-white metal found throughout the crust in minerals like bauxite germinate and coal It has an atomic mass of 69723 a melting point of 2978Ca boiling point of 2204C a density of 5907 gcm its a solid at room temperature
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