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The nineteenth century was the golden age for the discovery of elements.
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"The nineteenth century was the golden age for the discovery of elements. Scientists began to look for patterns of behaviour between elements."*1 Johann Döbereiner, a German chemist, was the first to attempt to categorise the elements. He used their atomic weights, which we now know as atomic masses. In 1863, John Newlands, produced something that he called the 'Law of Octaves'. He used this to produce his own version of the periodic table, but Newlands came across some problems. "After about 20 elements his table became ragged,"*2 Newlands had left no gaps for undiscovered elements and even had to put two elements in one space. It was Dimitri Mendeleev, a Russian chemistry professor, in 1869 that produced a much improved table. He amended many of the atomic weight values and left gaps for undiscovered elements. "Mendeleev was so confident of the basis upon which he had drawn up his table...
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