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chem

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which pair of atoms represent nuclei that have the same number of neutrons?
a Co36 and Co 58
b. Mn57 and Fe 57
c. Ni 58 and Fe 57
d. Ni 58 and Co 57
e. Ni 59 and Fe 56

  • chem -

    #protons + #neutrons = mass number.
    Example:
    Fe56 is
    protons = 26
    mass number = 56
    26 + ? = 56
    ? = number neutrons = 56-26 = 30

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