CG4+Evolution+of+the+Periodic+Table

Answer the questions, in complete sentences based on the article from Scientific American "The Evolution of the Periodic System".

1.) For each scientist listed, describe the contribution to the development of the periodic table. Antoine Lavoisier - with Louis-Bernard Guyton de Morveau and Claude-Louis Berthollet devised a list of the 33 elements known at the time. Johann Dobereiner - **Pointed out that many of the known elements could be arranged by thier similarities into groups of three traids.** Peter Kremers - Jean-Baptist-Andre Dumas - Focused on devising a set of mathematical equations account for the increase in atomic weight among several groups of chemically similar elements. Alexandre Emile Beguyer de Chancourtois - Created and arrangement of elements by atomic weight. Relied on fairly intricate geometric configuration. John Newlands - suggested that when the elements were arranged in order of atomic weight, anyone of the elements showed properties similiar to those of the elements 8 places ahead and behind. Julius Meyer - Produced a periodic table that turned out to be remarkably similiar to Mendeleev's- but failed to classify all the elements correctly. Henry Mosely - Tested the hypothesis that the ordering principal for the periodic table lay instead in the nuclear share of each atom.

2.) What properties did Mendeleev use to arrange his periodic table? Used the periodic table to predict several new elements and the properties of their compounds. 3.) What were some of the problems with Mendeleev's table? What discoveries support Mendeleev's Table? did not include Noble gasses. 4.) On which properties is the modern periodic table arranged? the elements show patterns in their chemical properties in certain regular intervals. 5.) Why is it called the __Periodic__ Table of the Elements? reflects the fact that the elements show patterns in their chemical properties in certain regular intervals.

Koralee Ford, Katelyn Slowik, Connor Coppola, Jeremy Reid.

Nicely done! Ms. H.