Determine element that mass number of anion is given, Chemistry

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The mass number of an anion,   X3- is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, X2  of the element will be:

(1) 10    

(2) 14   

(3) 7       

(4) 5

Ans: 7

 

 


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