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As planetesimals collided, various fragments were scattered and produced meteorites.

Iron meteorites were identified as pieces of the core, while stony meteorites were segments of the mantle and crustal units of these various planetesimals.

The rows of the table are called periods; the columns are called groups.

Six groups have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases.

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Enter a word (or two) above and you'll get back a bunch of portmanteaux created by jamming together words that are conceptually related to your inputs.If the sample behaved as a closed system then graphing the difference between the present and initial ratios of Pb should produce a straight line.The distance the point moves along this line is dependent on the U/Pb ratio, whereas the slope of the line depends on the time since Earth’s formation. The development of the Geochron was mainly attributed to Clair Cameron Patterson’s application of Pb-Pb dating on meteorites in 1956.The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized.The periodic table provides a useful framework for analyzing chemical behaviour, and is widely used in chemistry and other sciences.

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