Periodic Table of Elements: Innovate
When Dmitri Ivanovich Mendeleev became a professor of general chemistry at the University of St. Petersburg, he was unable to find a suitable textbook...so he began to write his own. His textbook The Principles of Chemistry, written between 1868 and 1870, provided a framework of inestimable value to modern chemical and physical theory. Scientists of the Enlightenment and the early 19th century brought rigor to the study of nature's composition, previously the domain of alchemists and philosophers. By Mendeleev's time, scientists had identified 60 elements (out of today's 110 total confirmed elements), classified according to various schemes, and also detected the existence of atoms—which they, and later Mendeleev himself, believed to be the basic units of physical composition. (Protons, neutrons, and electrons were identified later, by Sir Ernest Rutherford.) Mendeleev's innovation was to arrange the known elements in a table that reflected elements' recurring properties (hence, their periods). Gaps in the table, initially believed to indicate flaws in his reasoning, actually predicted new elements discovered later! Elements are arranged from left to right, and from top to bottom, in order of increasing atomic number—representing the number of electrons in an atom. The table is arranged into seven periods—the horizontal rows, and eight groups—the vertical columns (excluding the Transitional elements, the groups include the two leftmost and six rightmost columns). Elements in the same period have the same number of atomic shells—the number of layers of electronic orbit. Elements in the same group have the same number of electrons in their outermost shell (with the occasional exceptions of Hydrogen and Helium), which influences how atoms of a given element mix with atoms of another.
Articulation of the Periodic Law contributed to later scientific theories of atomic properties, and ultimately, to Quantum Mechanics. The Periodic Table remains indispensable to the work of chemists and physical scientists because it provides a concise reference to atomic properties, and helps them to predict how atoms of different elements will interact with one another. Mendeleev's breakthrough brought a new paradigm to the study of chemistry and made possible a host of new discoveries in the decades following. How can you make the leap from the known to the unknown? How can you bring order to chaos? How can you innovate? It begins with communication. Throughout our nearly quarter century of helping organizations achieve their goals, we have developed communication programs that help organizations of diverse scale and scope—start-up to centenarians—engage, involve, and entertain their constituents. Explore our client credentials, learn more about how we think, follow the trail below to more information about emoticons, or contact us to learn how we can help you build effective communications systems. For more information"Physical Sciences" Encyclopaedia Britannica. 15th ed. 2002. "Chemical Elements" Encyclopaedia Britannica. 15th ed. 2002. The Origin of the Periodic Table Los Alamos National Laboratory Periodic Table of the Elements The Periodic Table of Elements The Periodic Table of Elements
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