- published: 09 Sep 2009
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The periodic table is a tabular display of the chemical elements, organized on the basis of their properties. Elements are presented in increasing atomic number. The main body of the table is a 18 × 7 grid, with gaps included in to keep elements with similar properties together, such as the halogens and the noble gases. These gaps form four distinct rectangular areas or blocks. The f-block is not included in the main table, but rather is usually floated below, as an inline f-block would make the table impractically wide. The periodic table accurately predicts the properties of various elements and the relations between properties. As a result, it provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.
Although precursors exist, the current table is generally credited to Dmitri Mendeleev, who developed it in 1869 to illustrate periodic trends in the properties of the then-known elements; the layout has been refined and extended as new elements have been discovered and new theoretical models developed to explain chemical behavior. Mendeleev's presentation also predicted some properties of then-unknown elements expected to fill gaps in his arrangement; these predictions were proved correct when those elements were discovered and found to have properties close to the predictions.
Christopher Edward Martin (born March 21, 1966), better known by his stage name DJ Premier (also known as Preem, Premo, or Primo for short), is an American record producer and DJ, and was the instrumental half of the hip hop duo Gang Starr, together with emcee Guru. Born in Houston and raised in Prairie View, Texas, he has lived in Brooklyn, New York, for much of his professional career. Rolling Stone identified Premier as arguably Hip-Hop's greatest producer of all time.
The Source named DJ Premier one of the five greatest producers in hip-hop history, while the editors of About.com ranked him #1 on their Top 50 Hip-Hop Producers list. He also made the "Finals" in the search for The Greatest Hip-Hop Producer of All Time by Vibe. He attended Prairie View A&M University.
Premier is known for producing all of Gang Starr's songs as well as many of the Gang Starr Foundation's songs. His work also includes production for heavyweight rappers such as (alphabetic order) Apathy, Big L, Bun B, Canibus, D.I.T.C., Fat Joe, Game, Jay-Z, Kanye West, KRS-One, Lord Finesse, M.O.P., Mos Def, Nas, Rakim, Royce Da 5'9", The LOX, The Notorious B.I.G., Snoop Dogg, Xzibit, rock band Limp Bizkit, Big L, Big Daddy Kane, Ill Bill, Joell Ortiz, and pop/R&B singer Christina Aguilera, among many others.