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26 August, 15:12

For which of the following elements is the number of neutrons correctly represented, based on the atomic number and mass number given? A. iron: atomic number 26, mass 56, neutrons 30 B. neon: atomic number 10, mass 20, neutrons 9 C. potassium: atomic number 19, mass 39, neutrons 19 D. phosphorus: atomic number 15, mass 31, neutrons 15

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  1. 26 August, 15:42
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    Answer: A. iron: atomic number 26, mass 56, neutrons 30

    Explanation:

    Atomic number = proton = 26

    Mass number = 56

    Mass number = proton + Neutron

    56 = 26 + Neutron

    Neutron = 56 - 26

    Neutron = 30
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