The nucleus of the element 21e45 contains, Chemistry

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The nucleus of the element 21E45  contains:

(1) 45 protons and 21 neutrons  

(2) 21 protons and 24 neutrons

(3) 21 protons and 45 neutrons 

(4) 24 protons and 21 neutrons

Ans:  21 protons and 24 neutrons


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