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21 June, 23:38

For al, its atomic number is 13 and its mass number is 27. how many neutrons does it have

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  1. 22 June, 00:17
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    Atomic number is the same number as the amount of protons. Atomic mass is the sum of protons and neutrons: the two sub-atomic particles only found in the atomic nucleus. Number of neutrons is equal to atomic mass (z) - atomic number (n), so 27-13=14 neutrons
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