Atoms of manganese- 55, iron-56, and nickel-58 have same number of neutrons and different number of protons.
Number of protons:
It is same as the atomic number of an element.
Number of Neutrons:
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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