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Indium is a silvery white metal with a strong luster, resembling a fresh cut of zinc in appearance. It belongs to the group of light metals. It is quite soft, moreover malleable and low-melting (melts at a temperature of 156.5 ° C). Indium can be easily cut with a knife; it is almost 5 times softer than lead. Leaves a mark on paper. It is quite rare, valuable and expensive metal. In terms of chemical properties, indium is similar to gallium and aluminum. Its atomic mass is 114.818 g / mol. The element consists of two isotopes, one of which has a rather weak β-radioactivity.... Silver - Ag, a mineral of the class of native elements, crystallizes in a cubic system, cubic-hexoctahedral symmetry. It is found in argenites (sulfide) and horny silver (silver chloride), and is also mined as a by-product of the purification of copper and lead. Silver was one of the first metals mastered by man. It is an excellent conductor of heat and electricity. Mexico is the main producer of silver,..