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MONETARY UNIT: The zloty (z) is a paper currency of 100 groszy.
There are coins of 1, 2, 5, 10, 20, and 50 groszy and 1, 2, 5, 10, 20, 50, and 100 zlotys, and notes of 10, 20, 50, 100, 200, 500, 1,000, 2,000, and 5,000 zlotys.
Element Classification: Halogen Isotopes: Fluorine has 17 known isotopes ranging from F-15 to F-31.
F-19 is the only stable and most common isotope of fluorine.
These unstable atoms tend to "decay" into stable ones; they do this by emitting a particle or particles. The time it takes for half of a given amount of a radioactive element to decay into a stable one is what is known as the "half-life".By matching the proportion of original unstable isotope to stable decay product, and knowing the half-life of that element, one can thus deduce the age of the rock, as shown in the following diagram.Even in the case of very long half-lives, modern scientific instruments are now accurate enough to give very fine readings.The practical range for dating is in the order of a few hundred to about 40,000 years BP.Any further back than that and your standard deviations go way up.
But these inaccuracies are the result of variation in the level of Carbon 14 in the atmosphere, and when this is worked out (through calibration with tree rings of the bristlecone pine, the oldest living organism) precise dates can be had.