An element form an oxide mo2. Its belong to 3rd prieads in morden periodic table find its feclency , atomic no .wirte the formula or this oxide
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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
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