For example the atomic weight of indium ie 76 was based on the assumption that indium oxide had the formula InO. Based on this corrected formula the atomic weight of indium is 113. Solved Use The Building Up Principle To Obtain The Electron Chegg Com 1 SiO2 71-73 2 Na2O 12-14 3 CaO 10-12 Sodium per oxide and calcium oxide decrease the softening point of the glass from 1600 to 730 so that soda lime glass is easier to form and addition of 74 of magnesium oxide in soda lime glass is to prevent it from cracks and then an addition of 05 to 15 of alumina can. . Mendeleeff corrected the formula of indium oxide from InO to In2O3. This atomic weight placed indium which has metallic properties among the nonmetals. Sr name percentage no.