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Ch16 Science

Science notecards for chapter 16; Atomic Energy

Radioactivity The process by which an unstable nucleus gives off nuclear radiation.
Mass Number The sum of the numbers of protons and neutrons in the nucleus of an atom.
Isotope An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
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 reactions.
Nuclear Fusion The combination of the nuclei of small atoms to form a larger nucleus; releases energy.
Created by: mascoutah