A metal m forms an oxide having the formula m2o3. It belongs to the 3rdperiod in the modern periodic table. Write the atomic number and valency of the met
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A metal m which forms an oxide having the formula m2o3 from 3rd period is aluminum. Aluminum has atomic number 13 and 3 valance electrons in outer shell. Valency of Aluminum is +3. It will form Al2O3 oxide.
Al2O3 is an amphoteric compound with melting point 2072 C. Due to its amphoteric nature can react with acids and bases.
Al2O3 is also called as alumina, aloxide or alundrum. It provides resistance to metallic aluminum to weathering. Relative higher thermal conductivity of Al2O3 makes it a good electrical insulator. It is insoluble in water.
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Answer:Period no. = no. of shells, so n = 3 From the formula M2O3 its valency is 3. Since it is a metal, its valence shell has 3 electrons. So its electronic configuration is 2, 8, 3 Atomic number =13 Hence the metal is Aluminum with valency 3.
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