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Chapter 16 PhysicalS
Chap 16 Physical Science
Question | Answer |
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Radioactivity | The process by which an unstable nucleus gives off radiation. |
Mass Number | Thw sum of the number of protons and neutrons in the nucleus of an atom. |
Isotope | An atom that has the same number of protons (or the same atomic number)as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass) |
Half-life | The time needed for half of a sample of a radioactive substance to undergo radioactive decay. |
Nuclear Fission | The splitting of the nucleus of a large atom into two or more fragments; releases additional neutrons and energy. |
Nuclear Chain Reaction | A continuous series of nuclear fission reactons. |
Nuclear Fusion | The combination of the nuclei of small atoms to form a larger nucleus; releases energy. |