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Biology Chapter 14.2

TermDefinition
Radiometric Dating A method of determining the absolute age of an object by comparing the relative percentages of a radioactive (parent) isotope and 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 (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.
Microsphere A microscopic spherical structure composed of many protein molecules that are organized a as a membrane.
Coacervate A mass of droplets of colloidal substances, such as lipids, amino acids, and sugars that are held together by electrostatic attraction.
Created by: DragonT20