Atoms of manganese- 55, iron-56, and nickel-58 have same number of neutrons and different number of protons.
It is same as the atomic number of an element.
It is the difference between the mass number and atomic number or number of protons.
No. of protons = 25
No. of neutrons = 30
No. of protons = 26
No. of neutrons = 30
No. of protons = 28
No. of neutrons = 30
Thus, the number of neutrons in all the atoms is same i.e. 30.
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