Krishnapriya R

#ppt #grade 8 #education #easy concept #average atomic mass #radioactive isotopes #isotopes #structure of an atom #class9 #biodiversity #bio #ch6 #biology #conservation of biodiversity #metals #chemical properties #hindi #war #kargil vijay diwas #need to know #rules #india #our national flag #needed #career #student needs to learn maths #learning #importance #mathematics