Since neutrons have no charge, they don't affect the chemical behavior of an element (besides its mass).Therefore, any mineral that contains potassium (K) will contain a mixture of all its isotopes (39, 40, and 41).This definition can be misleading, however, without some qualification.First, all radiometric dating methods are scientific models used to estimate the age of geologic events, provided a number of physical assumptions regarding the rock's history are met.When 40K decays radioactively, it produces both 40Ar (argon) and 40Ca (calcium), with a half-life of 1.25 billion years.
Confusion of these terms is a sure sign of geological ignorance.In this sense, it is much like estimating the origin of a cannonball in flight, using a set of physical observations and the laws of gravity.Secondly, radiometric dating methods (K-Ar in particular) do not estimate the age of a rock, but the time at which a mineral in that rock was last near a given temperature (called the closing temperature).So now that you are better prepared, let's continue!Over the years, Answers in Genesis has committed to undermining the credibility of radiometric dating techniques.
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