Here Eric Scerri looks at the trends in properties of elements that led to the construction of the periodic table & how the deeper meaning of its structure gradually became apparent with the development of atomic theory & quantum mechanics so that as Scerri puts it one science physics arguably came to colonize another chemistry although such a view is resisted by chemists. Scerri shows that quantum mechanics is absolutely central to chemistry as it underlies the behaviour of all of the elements & their compounds & therefore underpins the structure of the periodic table. Concluding with an overview of the huge variety of periodic tables that have been proposed in the print media & on the Internet he explores the debated question of whether there is an optimal periodic table & what form it might take. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts analysis perspective new ideas & enthusiasm to make interesting & challenging topics highly readable.