Question:থায়োসালফেট ‍`S_2O_2^2-`আয়নে যোজন ইলেকট্রনের সংখ্যা কত? 

A 28 
B 30 
C 32 
D 34 

+ Answer
C 

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Md. Shariful Islam

Editor, VCampus

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