How does the nucleus of a copper atom compare to the nucleus of a nickel

Explanation: Nickel atoms have 28 protons in their atomic nuclei, giving nickel theatomic number 28. In addition to 28 protons, a nickel atomic nucleus contains 30 to 36 neutrons, depending on the isotope. ... The atomic nuclei of copper also include 34 to 37 neutrons, depending on the isotope.

I think a trough because a trough has more surface area so therefor more heat can go to each part and therefor it melt faster
don't know the answer