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Please can someone help me define atomic number, Mass number and isotopy urgently​
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Please can someone help me define atomic number, Mass number and isotopy urgently​

User Hackbod
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Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the total number of protons and neutrons in an atom's nucleus
User Rahatur
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