Civil Rights
Movements, leaders, victories and the continuing fight for equality.
Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
D block, Block D, or variants, may refer to:
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D block, Block D, or variants, may refer to: d-block, a division of the periodic table of elements D-Block Records, a hip-hop record label D-Block at Alcatraz Federal Penitentiary Block D, a Soviet rocket stage Block D, a portion of the United States 2008 wireless spectrum auction that was not sold during the auction
d-Block contraction or scandide contraction refers to the consequences of a full 3d subshell on the properties of period 4 elements. The elements in question are gallium, germanium, arsenic, selenium, bromine, and krypton. Their electronic configurations include completely filled d orbitals (d10). The d-block contraction is best illustrated by comparing some properties of the group 13 elements to highlight the effect on gallium. Gallium can be seen to be anomalous. The most obvious effect is that the sum of the first three ionization potentials of gallium is higher than that of aluminium, whereas the trend in the group would be for it to be lower. The second table below shows the trend in the sum of the first three ionization potentials for the elements B, Al, Sc, Y, and La. Sc, Y, and La have three valence electrons above a noble gas electron core. In contrast to the group 13 elements, this sequence shows a smooth reduction. Density functional theory calculations indicate that scandide contraction should manifest itself in the ionization potentials of monovalent Group 13 compounds (“trielylenes”) and zero-valent (“tetrylones”) and divalent Group 14 (“tetrylenes”) compounds, resulting in local maxima at gallium and germanium. The inert pair effect, which owes significantly to relativistic effects, results in similar elevations of ionization potentials for thallium and lead compounds. Together, these electronic effects result in a zigzag distribution of ionization potentials down Groups 13 and 14, a phenomenon that has been described as secondary periodicity. The best-known structural effect of scandide is the unexpectedly small ionic radius of the Ga3+ ion, which is almost identical to that of the Al3+ ion. Many examples illustrate the effect for trivalent Group 13 compounds, but the effect is also observed for monovalent aluminum and gallium. The cause of the d-block contraction is the poor shielding of the nuclear charge by the electrons in the d orbitals. The outer valence electrons are more strongly attracted by the nucleus causing the observed increase in ionization potentials. The d-block contraction can be compared to the lanthanide contraction, which is caused by inadequate shielding of the nuclear charge by electrons occupying f orbitals.
Life on D-Block is the fourth solo studio album by American rapper Sheek Louch. It was released on May 19, 2009, via Real Talk Entertainment. Production was handled by Cozmo and Big Hollis. The album debuted at number 122 on the Billboard 200 chart, selling 4,300 copies in its first week.
The D-Block Boys, also known as DBG, was an American criminal street gang that operated in Algiers, New Orleans, Louisiana. The gang has been involved in criminal activity including drug trafficking and multiple murders. According to NOPD, The "D-Block Gang" has a history of violations, along with involvement in violent crimes. This gang is not to be confused with the Dumaine street drug ring operating out of the 6th Ward of New Orleans, which is also called D'Block.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Madam C.J. Walker