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14 September, 04:40

What is atomic and mass number

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  1. 14 September, 04:47
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    The Atomic Mass Number is the number underneath the Element symbol and it is the atomic mass of the element. You can easily find the atomic mass (or get a very close number to it) by adding the protons and neutrons together. If there are 2 protons and 2 neutrons, the atomic mass would be 4.
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