The Aufbau principle (from German Auf bau prin zip, “building-up principle”), rationalization of the distribution of electrons among energy levels in the ground (most stable) states of atoms.The principle, formulated by the Danish physicist Niels Bohr about 1920, is an application of the laws of quantum mechanics to the properties of electrons subject to the electric field created by the positive charge on the nucleus of an atom and the negative charge on other electrons that are bound to the nucleus. The building-up denoted by the name of the principle is a hypothetical process in which the electrons are regarded as entering, one by one, this electric field and assuming their most stable conditions with respect to it. See also electronic configuration.
Adad was a weather god of the Babylonian and Assyrian pantheon. The name Adad may have been brought into Mesopotamia toward the …..
Adair v. the United States refers to (1908), case in which the U.S. Supreme Court upheld “yellow dog” contracts forbidding workers from joining ……..
Adal was the historic Islāmic state of eastern Africa, in the Danakil-Somali region southwest of the Gulf of Aden, with its capital at Harer ……………
Adalbert died c. 966. Adalberto Lombard was king of Italy who shared the throne for 11 years with his father, Berengar II, and after Berengar’s …….
Adalbert Kuhn was born on November 19th, 1812 inKönigsberg,Prussia [nowKaliningrad,Russia] and died May 5th, 1881,Berlin,Germany (acc 13)
Human ageing and the Nervous system: Changes in the structures of the brain due to normal ageing are not striking. It is true …
Atto Adalbert died in 988. He was an Italian Azzo Adalberto count of Canossa (located near Reggio nell’Emilia, Italy) and founder …….
Adam and Eve were in the Judeo-Christian and Islāmic traditions, the original human couple, parents of the human race ……………
Adam De La Halle was born c. 1250 in Arras, France and died c. 1306 in Naples. ………….
Adam’s Bridge is also called Rama’s Bridge, a chain of shoals, between the islands of Mannar, near northwestern Sri Lanka, and Rāmeswaram ………..
Adolphe Adam was born on July 24th 1803 in Paris, France and died on May 3rd, 1856 in Paris ……….
Robert Adam was born on July 3rd, 1728 in Kirkcaldy,Fife,Scotland. He died on March 3rd, 1792 inLondon,England ……….
The primary age change in the skin is a gradual loss of elasticity. Although this basic change plays a role, other factors, such as exposure to the weather and familial traits, also contribute ……
The Adamawa Plateau, also spelled Adamaoua Plateau, is an volcanic upland in west-central Africa. Though chiefly in north-central Cameroon, part ……….
Louis Adamic was born on March 23rd, 1899 in Blato, Slovenia, Austria-Hungary [now in Slovenia] and died September 4th, 1951, near Riegelsville …………
Saint Adamnan was born c. 625 in County Donegal, Ireland and died 704, feast day September 23. Adamnan is also spelled Adomnan, also called Eunan ………..
Arthur Adamov was born on August 23rd, 1908 inKislovodsk,Russia and died on March 16th, 1970 inParis,France. ….
With ageing, the bones gradually lose calcium. As a result they become more fragile and are more likely to break, even with minor falls ….
Gerry Adams was born on October 6th, 1948 in Belfast, Northern Ireland. Adams, in full Gerard Adams, was president of Sinn Féin, the political wing ……………..
Franklin Pierce Adams was born on November 15th, 1881, in Chicago, USA and died on March 23rd, 1960 in New York City ……………
