The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. what is the mass defect (in amu) of a ni nucleus? (the mass of a nickel- 60 nucleus is 59.9308 amu.)

Mass Defect: 0.5505 amu.

A nickel-60 atom contains sixty nucleons (neutrons and protons).

According to the question,

Mass of the 60 nucleons shall add up to .

The mass defect of a nucleus is "the difference between the sum of masses of [its] components and [its] measured [mass]." ("Map: A Molecular Approach (Tro)", Chemistry Libretexts)

According to the question, the measured mass of a nickel-60 nucleus is 59.9308 amu.

The difference between the sum of the masses of its nucleon components and the mass of its nucleus is, therefore, (accurate to four decimal places.)

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