Number of protons, neutrons and electrons in the element, Chemistry

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Number of protons, neutrons and electrons in the element  231/89 y is:

(1) 89, 231, 89  

(2) 89, 89, 242   

(3) 89, 142, 89      

(4) 89, 71, 89

Ans:  89, 142, 89


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