|Nuclei ____ during nuclear fusion reactions.
|C-14 is a natural isotope used for ____ dating.
|Uranium-238 is used to date ____ samples (rocks, meteorites).
|A ____ ray is a photon emitted by a radioactive substance.
|All carbon isotopes (e.g. C-12 and C-14) have ____ protons.
|C-12 is a stable isotope, whereas C-14 is a ____ isotope.
|All helium isotopes have ____ protons.
|Carbon-14 has 6 protons and ____ neutrons.