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28 December, 03:53

The atomic number of manganese is 25; its mass number is 55. How many neutrons does an atom of manganese have in its nucleus?

a) 25 b) 80 c) 30 d) 55

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  1. 28 December, 04:09
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    c) 30

    Explanation:

    In an atom, the relation between the subatomic particles of the atom are given as follows -

    For a neutral atom,

    Atomic number = number of protons = number of electrons,

    Mass number = number of protons + number of neutrons,

    Hence, from the given information of the question,

    Atomic number of Manganese = 25,

    mass number of Manganese = 55,

    Now, to calculate the number of neutrons, the above relation can be used -

    Mass number = number of protons + number of neutrons,

    Rearranging,

    number of neutrons = Mass number - number of protons

    substituting the respective values,

    number of neutrons = 55 - 25 = 30.
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