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Topic: Atom plum pudding

	Plum pudding model - Encyclopedia, History, Geography and Biography
		The plum pudding model of the atom was proposed by J.
		The plum pudding model was proposed in March, 1904 before the discovery of the atomic nucleus.
		In this model, the atom is composed of electrons (which Thomson still called "corpuscles," though Stoney had proposed that atoms of electricity be called electrons in 1894), surrounded by a soup of positive charge to balance the electron's negative charge, like plums surrounded by pudding.
	www.arikah.com /encyclopedia/Plum_pudding_model (430 words)

	NationMaster - Encyclopedia: Christmas pudding
		Christmas pudding is a steamed pudding, heavy with dried fruit and nuts, and usually made with suet.
		Traditionally, Christmas puddings were boiled in a pudding cloth, and they are often represented as round, but at least since the beginning of the twentieth century they have usually been prepared in basins.
		Once turned out of its basin, the Christmas pudding is traditionally decorated with a spray of holly, and it may be doused in brandy, flamed (or 'fired'), and brought to the table ceremoniously - where it may be greeted with a round of applause.
	www.nationmaster.com /encyclopedia/Christmas-pudding (3334 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		The plum pudding model of the atom was proposed by J.
		In this model, the atom is composed of electrons (which Thomson still called "corpuscles," though G.J. Stoney had proposed that atoms of electricity be called electrons in 1894), surrounded by a soup of positive charge to balance the electron's negative charge, like plums surrounded by pudding.
		"On the Structure of the Atom": an Investigation of the Stability and Periods of Oscillation of a number of Corpuscles arranged at equal intervals around the Circumference of a Circle; with Application of the Results to the Theory of Atomic Structure" — J.J. Thomson's 1904 paper proposing the plum pudding model.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Plum_pudding_model (399 words)

	The Atom
		A prevailing model of the atom at the time (the Thomson, or "plum-pudding," atom) proposed that the negatively charged electrons (the plums) were mixed with smeared-out positive charges (the pudding).
		It was largely the evidence from this type of experiment that led to the model of the atom as having a nucleus.
		The only model of the atom consistent with this Rutherford experiment is that a small central core (the nucleus) houses the positive charge and most of the mass of the atom, while the majority of the atom’s volume contains discrete electrons orbiting about the central nucleus.
	www.lbl.gov /nsd/education/ABC/wallchart/chapters/02/1.html (500 words)

	Plum pudding model
		The Plum pudding model of the atom was made after the discovery of the electron but before the discovery of the proton or neutron.
		In it, the atom is envisioned as electrons surrounded by a soup of positive charge, like plums surrounded by pudding.
		This model was disproved by an experiment by Ernest Rutherford when he discovered the nucleus of the atom.
	www.ebroadcast.com.au /lookup/encyclopedia/at/Atom___plum_pudding.html (62 words)

	Atom plum pudding
		The plum pudding model of the atom was proposed by J. Thomson, the discoverer of the electron in 1897.
		The plum pudding model was proposed in 1906 before the discovery of the...
		This became known as the 'plum pudding' model of the atom and is...
	www.logicjungle.com /wiki/Atom/plum_pudding (324 words)

	S-Cool! - GCSE Physics Revision - Quicklearn
		The only difference between one atom and the next is the number of these particles in the atom.
		Atoms occupied the correct amount of space (it was the space filled by the sponge).
		The mass of the atom was about right (because although the sponge filled the whole of the atom, it was very low density).
	www.s-cool.co.uk /topic_quicklearn.asp?loc=ql&topic_id=7&quicklearn_id=1&subject_id=16&ebt=319&ebn=&ebs=&ebl=&elc=4 (574 words)

	Inside the Atom
		His theory stated that "atoms of each element is different by their weight from the atoms of every other element".
		In a reaction, the atoms of the different elements combine and make new and more particles, But after the reaction the first atoms are always there in a "fixed ratio".
		The plum pudding atom had negatively charged electrons which were represented by the raisins, which were also stuck into a lump of positively charged protons which was the dough.
	hoover.sandi.net /course/TRITON/AMP/PERIOD1/GroupA/index.html (861 words)

	The Electron Centennial Page
		Atoms, by definition, were the smallest bits of matter that could exist.
		The English physicist Lord Kelvin pictured the atom as a sphere of positive matter, with the electrons stuck in it like raisins in a cake, or plums in a pudding.
		The plum-pudding atom came to be known as the "Thomson atom.
	www.davidparker.com /janine/electron.html (2514 words)

	Plum Pudding Model
		In Thomson’s "Plum Pudding Model" each atom was a sphere filled with a positively charged fluid.
		The fluid was called the "pudding." Scattered in this fluid were electrons known as the "plums." The radius of the model was 10
		Thomson suggested that the positive fluid held the negative charges, the electrons, in the atom because of electrical forces.
	library.thinkquest.org /28582/history/plum.htm (131 words)

	Atom Model (Site not responding. Last check: )
		structure of an atom is mainly a sphere.
		students, contributed greatly to the evolution of the modern model of an atom.
		the existence of a nucleus in an atom.
	www.scienceinformer.com /Atom-Model.html (196 words)

	Project Brainstorm
		Atoms used to resemble a plum pudding, but nowadays they resemble an onion.
		If the atom is the size of the average supporter's head, the electrons are like his tiny, tiny brain, rattling away inside, unable to do anything but direct imaginative swearwords at the referee.
		The plum pudding image was a very lazy way of imagining atoms.
	www.projectbrainstorm.net /2005_02_01_projectbrainstorm_archive.html (3471 words)

	From Thomson's Corpuscles to the Electron
		Larmor devised a theory of the electron that described it as a structure in the ether (the invisible elastic fluid that was proposed as a substrate for light and other electrical phenomena).
		Thomson proposed a model, sometimes called the "plum pudding" or "raisin cake" model, in which thousands of tiny, negatively charged corpuscles swarm inside a sort of cloud of massless positive charge.
		Rutherford suggested that the atom might resemble a tiny solar system, with a massive, positively charged center circled by only a few electrons.
	www.aip.org /history/electron/jjelectr.htm (417 words)

	The Development of the Model of the Atom
		In this model the atom was a positive charged core (ball) in which negatively charged particles (electrons) were embedded like raisins in a pudding.
		Probably the most serious problem with the planetary model is that an orbiting electron has a centripetal acceleration and (according to Maxwell's theory of electromagnetism) ought to lose energy by emitting electromagnetic radiation at a frequency equal to that of the orbital motion (the reciprocal of the orbital period).
		His idea was that the oscillating electrons of the surface atoms of the fl body emitted radiation according to Maxwell's laws of electromagnetism.
	www.clickandlearn.org /chemistry/atomic_theory.htm (1837 words)

	Media Portfolio
		The bottom figure shows the model of the atom that developed from this experiment, that most of the atom's volume is empty space with a dense positively charged nucleus.
		A portion of the hydrogen atom model is shown with the nucleus at the center of the atom and with the electron in one of a set of discrete orbits nÊ=Ê1, 2, 3, 4, p.
		Silver atoms vaporized in the oven are shaped into a beam by the slit, and the beam is passed through a nonuniform magnetic field.
	cwx.prenhall.com /bookbind/pubbooks/hillchem3/medialib/media_portfolio/07.html (1734 words)

	SparkNotes: SAT Physics: The Discovery of the Atom
		This unexpected result shows that the mass of an atom is not as evenly distributed as Thompson and others had formerly assumed.
		Rutherford’s conclusion, known as the Rutherford nuclear model, was that the mass of an atom is mostly concentrated in a nucleus made up of tightly bonded protons and neutrons, which are then orbited by electrons.
		The radius of an atom’s nucleus is about 1⁄10,000 the radius of the atom itself.
	www.sparknotes.com /testprep/books/sat2/physics/chapter19section2.rhtml (616 words)

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