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# The isotope 62(over)28Ni has the largest binding energy per nucleon of any isotope. Calculate this value from the atomic mass of nickel-62 (61.928345...

The isotope 62(over)28Ni has the largest binding energy per nucleon of any isotope. Calculate this value from the atomic mass of nickel-62 (61.928345 amu).

Here's what I got so far:

Ni-62. has 28p and 34n

the mass of 1 proton = 1.00727647 amu
the mass of 1 neutron = 1.00866492 amu

so..for 1 nucleus...
Δmass = 28x1.00727647amu + 34x1.00866492amu - 61.928345amu = 0.5700034 amu.. (with an extra sig fig)

converting...via E = mc²
E / nucleon = (0.5700034amu / nucleus) x (1.6605389x10^-27kg / 1amu) x (2.997924x10^8 m/s)² x (1 nucleus / 62 nucleons) = 1.37207x10^-12 J / nucleon
BUT it was WRONG??

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