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The now obsolete plum pudding model was the first scientific model of the atom with internal structure. It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897 and subsequently rendered obsolete by Ernest Rutherford 's discovery of the atomic nucleus in 1911. The model tried to account for two properties ...
J. J. Thomson. Sir Joseph John Thomson OM FRS [ 1] (18 December 1856 – 30 August 1940) was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be found. In 1897, Thomson showed that cathode rays were composed of previously unknown negatively charged particles (now ...
The first term is the Coulomb repulsion used above. This form assumes the alpha particle could penetrate the positive charge. At the time of Rutherford's paper, Thomson's plum pudding model proposed a positive charge with the radius of an atom, thousands of times larger than the r min found above. Fig. 1 shows how concentrated this potential is ...
Christmas pudding is sweet, dried-fruit pudding traditionally served as part of Christmas dinner in Britain and other countries to which the tradition has been exported. It has its origins in medieval England, with early recipes making use of dried fruit, suet, breadcrumbs, flour, eggs and spice, along with liquid such as milk or fortified wine ...
The seakeeping qualities of boats and ease of construction matched to the available Packard engines made a perfect combination. PT-109 was an 80 ft (24 m), 40-ton Elco motor torpedo boat (MTB), one of hundreds built by the firm between 1942 and 1945 in Bayonne, New Jersey.
Its origin probably lies in the English tradition wherein wealthy people of the community gave Christmas treats to the carolers on Christmas Eve, such as "figgy pudding" that was very much like modern-day Christmas puddings; [12] [13] [14] in the West Country of England, "figgy pudding" referred to a raisin or plum pudding, not necessarily one ...
Little Jack Horner. William Wallace Denslow ’s illustration of the rhyme, 1902. " Little Jack Horner " is a popular English nursery rhyme with the Roud Folk Song Index number 13027. First mentioned in the 18th century, it was early associated with acts of opportunism, particularly in politics. Moralists also rewrote and expanded the poem so ...
History of atomic theory. The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific discoveries.