chap 2, isotopes #chemistry9th
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9thclasschemistryPhysicsBiologyClass 9Class 10MatricFirst yearSecond yearClass 1010th ClassPeriodic tableNewton's lawGravityBranches of chemistryVernier caliperPeriodicity of periodic tableGroupsPeriodsHydrogenElectronic ConfigurationShellBohr Atomic modelRutherford's atomic theoryKreb cycleLaw of motionNewton's law of motion