|Uranium-238 is used to date ____ samples (rocks, meteorites).
|Tritium (two neutrons) is ____ than deuterium (one neutron).
|All carbon isotopes (e.g. C-12 and C-14) have ____ protons.
|C-14 is a natural isotope used for ____ dating.
|A ____ particle is a high-speed electron emitted by nuclei.
|A ____ ray is a photon emitted by a radioactive substance.
|An ____ particle consists of two protons and two neutrons.
|Carbon-14 has 6 protons and ____ neutrons.