Questions: 1) State the postulate of Dalton’s atomic theory which can explain the law conservation of mass? (mark-2) 2) Write the names of three elementary particles which constitue atoms? (mark-1) 3) Write the symbols of :         (mark-2) a) Lead     b) Boron 4) Electrons attribute negative charge, protons attribute positive … Continue reading CL9:Chemistry_SA-2_Important Questions