Multiple choice

The addition of a neutron to the nucleus of an atom results in the

  1. formation of an isobar

  2. formation of an isotope

  3. formation of an isotone

  4. increase in mass number and atomic number
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons. The addition of a neutron to the nucleus of an atom results in the formation of an isotope.

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