There are 3 boxes. In one box there are only isotopes in the other two boxes there are isotones and isobars. Which of the following boxes contains isotones?
Box C
Isotopes, "One of two or more atoms having the same atomic number but different mass numbers": Cobalt=55, Cobalt=56, Cobalt=57, Cobalt=58, Cobalt=59,(each has 27 protons) .
Isobar, "Any of two or more kinds of atoms having the same atomic mass but different atomic numbers": Manganese-56, Iron-56, Cobalt-56, Nickel-56, Copper-56(each have 56 amu/atom)
Isotones, "One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons": Manganese-56, Iron-57, Cobalt-58, Nickel-59, Copper-60 (31 neutrons each).