|All carbon isotopes (e.g. C-12 and C-14) have ____ protons.
|C-12 is a stable isotope, whereas C-14 is a ____ isotope.
|Nuclei ____ during nuclear fusion reactions.
|Carbon-14 is used to date organic ____ samples.
|C-14 is a natural isotope used for ____ dating.
|Nuclei ____ during nuclear fission reactions.
|Tritium (two neutrons) is ____ than deuterium (one neutron).
|A ____ ray is a photon emitted by a radioactive substance.