Question | Answer |
Cathode Ray | Ray of radiation that originates from the cathode end of the tube. |
Electron | negatively charged subatomic particle. |
Nucleus | small dense and centrally located within the atom. Contains all the atom's positive charge and virtually all of its mass. |
Proton | positively charged subatomic particle. |
Neutron | neutrally charged subatomic particle. |
Table O | illustrates the symbols, charges and masses of subatomic particles and nuclear emanations. |
Atomic Number | The number of protons in the nucleus of an atom. Identifies the atom. |
Isotope | Atoms with the same number of protons (atomic number) but different number of neutrons (mass number) |
Mass Number | The sum of the protons and the neutrons in the nucleus of an atom. |
AMU | Atomic Mass Unit - 1/12 the mass of a carbon-12 atom. |
Atomic Mass | The weighted average mass of all naturally occurring isotopes of an element. |
Nucleons | The subatomic particles found in the nucleus (protons and neutrons). |
Nuclear Reactions | A reaction that involves a change in an atom's nucleus. |
Radioactivity | A process occurring when a substance spontaneously emits radiation. |
Radiation | The rays and/or particles emitted by a radioactive material. |
Radioactive Decay | Occurs when unstable nuclei lose energy by emitting radiation in a spontaneous process. |
Alpha Radiation | Radiation deflected towards a negative plate. |
Alpha Particle | A particle with 2 protons and 2 neutrons. |
Nuclear Equation | illustrates the mass number and atomic number for each particle involved. |
Beta Radiation | Radiation deflected towards a positive plate. |
Beta Particle | A particle with negligible mass and a negative charge. |
Gamma Ray | High energy radiation that possess no mass or charge. |