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The Avogadro constant, commonly denoted NA [1] or L, [2] is an SI defining constant with an exact value of 6.022 140 76 × 1023 mol−1 ( reciprocal moles ). [3] [4] It is defined as the number of constituent particles (usually molecules, atoms, or ions) per mole ( SI unit) and used as a normalization factor in the amount of substance in a sample.
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On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. The bombings killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict. Japan surrendered to the Allies on 15 August, six days after the bombing of ...
Adolf Hitler. Adolf Hitler [a] (20 April 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Nazi Germany from 1933 until his suicide in 1945. He rose to power as the leader of the Nazi Party, [c] becoming the chancellor in 1933 and then taking the title of Führer und Reichskanzler in 1934.
Numeral or number prefixes are prefixes derived from numerals or occasionally other numbers. In English and many other languages, they are used to coin numerous series of words. For example: simplex, duplex (communication in only 1 direction at a time, in 2 directions simultaneously) unicycle, bicycle, tricycle (vehicle with 1 wheel, 2 wheels ...
Robert David Putnam (born January 9, 1941) is an American political scientist specializing in comparative politics. He is the Peter and Isabel Malkin Professor of Public Policy at the Harvard University John F. Kennedy School of Government .
Putnam District is a village [2] and census-designated place (CDP) in Windham County, Connecticut, United States. The CDP was formed when the former city of Putnam disincorporated, and it consists of the main town center of the town of Putnam along the Quinebaug River. The village is part of the Northeastern Connecticut Planning Region.
Coordination number. In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. This number is determined somewhat ...