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  1. Copper metal crystallizes with a face centred cubic (fcc) lattice .It has
  2. Which one of the alkali metals, forms only, the normal oxide, M₂O on heating
  3. The correct bond order in the following species is
  4. How many P = O bond present in (HPO₃)₃
  5. 12 g of an alkaline earth metal gives 14.8 g of its nitride .Atomic weight of the