Ratio between the neutrons in c & si with respect to atom, Chemistry

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The ratio between the neutrons in C  and  Si  with respect to atomic masses 12 and 28 is:

(1) 2 : 3 

(2) 3 : 2      

(3) 3 : 7            

(4) 7 : 3

Ans: 3 : 7

 


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