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electronic confiiguration first 20 elements class 9 worksheet notes pdf

 electronic confiiguration first 20 elements class 9 worksheet notes pdf

 

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useful links

 isotopes:
https://www.britannica.com/science/isotope
 
atomic mass
https://www.angelo.edu/faculty/kboudrea/periodic/structure_mass.htm 
 

 
 

 

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