How to find an atom that has the same number of neutrons as 59ni?

solution:

The atomic number of Ni is 28 (periodic table), therefore the number of protons is 28. The atomic weight is 59 therefore the number of neutrons plus protons is 59. 59-28=31 neutrons

I'm assuming the Ni has a 2 + charge, so the number of electron would be 26.