| Uranium-238 is used to date ____ samples (rocks, meteorites). |
6 |
| Tritium (two neutrons) is ____ than deuterium (one neutron). |
8 |
| All carbon isotopes (e.g. C-12 and C-14) have ____ protons. |
alpha |
| C-14 is a natural isotope used for ____ dating. |
beta |
| A ____ particle is a high-speed electron emitted by nuclei. |
gamma |
| A ____ ray is a photon emitted by a radioactive substance. |
geological |
| An ____ particle consists of two protons and two neutrons. |
heavier |
| Carbon-14 has 6 protons and ____ neutrons. |
radiocarbon |
