An analysis shows that the oxide of nickel consists of nickel ion with 96% ions having d8 configuration and 4% having d7 configuration.Which one of the following represents the formula of the oxide best?

Ni=3d84s2 (Atomic number - 28)∴Ni2+=3d8 and Ni3+=3d7Hence,96%Ni2+ ion and 4% of Ni3+ions are present. Let number of O2- ion Present in the crystal = XApplying electroneutrality rule,Total positive charge = Total negative charge0.96×2(+ ve charge )+0.04×3(+ ve charge )=x×2 (-ve charge) ∴0.96×2+0.04×3−2x=0∴x=1.02 So, formula of crystal Ni1.00O1.02 or Ni0.98O1.00