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Natural potassium contains 0.001 18 % of the radioisotopes k-40 ,which decays ,with a half life of 1.28 Gega years,partly to the stable isotope of argon , Ar -40.

Determination of the ratio k-40/Ar-40 gives an estimation of ages up to about 1000000 years.

The products of the cellular respiration formula are the reactants of the photosynthesis formula, and the reactants of the cellular respiration formula are the products of the photosynthesis formula. What you write for an ionic compound is called the formula unit, but the formula unit is almost always the same as the empirical formula.

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The age of geological specimens,which can be many millions of years old,is determined from the proportion of a natural radio nuclide (with a very long half life ) and its daughter nuclide contained in a sample of rock or mineral.

Potassium,in combination with other elements,occurs widely in nature especially in rocks and soil.

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