Q1. Calculate the mass of one atom of Oxygen in . Q2.Calculate the mass of One atom Of One molecule of water in gram Q3 Do balance the chemical equations question no 29 .Q30 Q31 Q32 from page no 40 and 41 Q4 Write down important postulates of Dalton's atomic theory page no 43. Q5.Write down modern atomic theory page no 43 Q6.Write down Discovery of electrons by discharge tube experiment with diagram. Q7. Write down properties of cathode rays. page no 44