Question

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?

• A. Box A
• B. Box B
• C. Box C
• D. None of these

Answer 1

The correct option is C

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).