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Atomic Structure Beginning of Paper The concept of the atom has existed since the 5th century BC, but it was not until the beginning of the 19th century that this concept was developed into a scientific theory. Almost as soon as the modern atomic theory was established, it was discovered that atoms were not the basic b .... Middle of Paper .... in different states. Bosons, too, may be this same object but in still another state. The everyday world is made of molecules. Because molecules are so small, their existence was not easy to establish. Indirect evidence for molecules was strong during the second half of the 19th century, and the first explicit evidence was found when Brownian motion was correctly understood and studied in about 1906 by physicists Albert Einstein and Jean-Baptiste Perrin. There are many kinds of molecules, and it was clear that simplifying ideas were needed. .... 827 words | 4 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95