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Biology Chapter 14

Biology Chapter 14 Section 2

TermDefinition
radiometric dating a method of determining the absolute age of an object by comparing the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope
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)
mass-number the sum of the numbers of protons and neutrons in the nucleus of an atom
radioactive decay the disintegration of an unstable atomic nucleus into one or more different nuclides, accompanied by the emission of radiation, the nuclear capture or ejection of electrons, or fission
radioactive isotope an isotope that has an unstable nucleus and that emits radiation
half-life the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
micro-sphere many protein molecules that are organized as a membrane in a spherical shape
coacervate a mass of colloidal substances held together by electrostatic attraction
Created by: cordier.marie
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