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Topic: Orbital atom model

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Wave model

Quantum physics

Wave mechanics

Bohr model

Pauli exclusion principle

Uncertainty principle

Classical physics

Bohr radius

Emission spectrum

Werner Heisenberg

	Atom - Wikipedia, the free encyclopedia
		Atoms of different elements do vary in size, but the sizes are roughly the same to within a factor of 2 or so.
		Atoms are generally classified by their atomic number, which corresponds to the number of protons in the atom.
		The atomic orbital wavefunctions of hydrogen atom hydrogen.
	en.wikipedia.org /wiki/Atom (1805 words)

	Atom - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-17)
		An atom is the smallest particle differentiable as a certain chemical element; when an atom of an element is divided, it ceases to be that element.
		Atoms with different numbers of neutrons are called isotopes of a chemical element.
		Orbitals are not physical contructs, but are actually probability distributions of where two electrons having equal values for the first three quantum numbers might be.
	encyclopedia.worldsearch.com /atom.htm (2043 words)

	Atomic physics - Wikipedia, the free encyclopedia
		Atomic physics (or atom physics) is physics of the electron hull of atoms.
		The beginning of atomic physics is marked by the discovery and scrutinious study of spectral lines.
		The study of these lines led to the Bohr atom model and on to our present understanding of the electron hull of the atom as described by the orbital atom model which is the basis of all understanding of chemistry.
	en.wikipedia.org /wiki/Atomic_physics (272 words)

	Science Fair Projects - Wave model
		The wave model of the atom uses the basic idea of the Bohr model of the atom, where there is a small, dense nucleus surrounded by electrons, but the electrons are represented by a probability distribution, instead of by discrete mathematical points.
		This model is based on quantum mechanics, specifically using the Schrödinger equation to calculate the probability distribution.
		A common example of applying the Schrödinger equation is visualization of the wave model of the hydrogen atom.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Wave_model (414 words)

	Bohr model - Wikipedia, the free encyclopedia
		Because of its simplicity, the Bohr model is still commonly taught to introduce students to quantum mechanics.
		The most simple atom is hydrogen, which consists of one proton and one electron bound together by the electrostatic force.
		The Bohr model is actually only accurate for one-electron systems such as the hydrogen atom or singly-ionized helium.
	en.wikipedia.org /wiki/Bohr_model (897 words)

	THE BOHR MODEL OF THE ATOM (Site not responding. Last check: 2007-10-17)
		In 1911 Neils Bohr postulated that an electron in the hydrogen atom would be stable as long as it was in a circular orbit of specified radius and energy.
		The energy and size of the orbital was described in terms of the quantum number n.
		Ultimately, the Bohr model proved to be unable to explain all the details of the hydrogen atom and did not work for multi-electron atoms.
	colossus.chem.umass.edu /chandler/ch111/bohratom.htm (273 words)

	The Bohr Model of the Atom (Site not responding. Last check: 2007-10-17)
		In 1913 Neils Bohr (1885-1962), a Danish physicist, proposed a theoretical model for the hydrogen atom.
		He chose hydrogen because its atoms are the simplest, having only one electron about the nucleus, and because it produces the simplest spectrum with the fewest lines.
		When the hydrogen atom absorbed energy, as it does in a gas discharge tube, the electron is raised from the orbit n = 1 to a higher orbit such as n = 2 or n = 3 or even higher.
	www.ucdsb.on.ca /tiss/stretton/chem1/elecon5.html (382 words)

	Bohr model
		The simplest possible atom is hydrogen, which consists of a nucleus and one orbiting electron.
		The Bohr model is sometimes known as the semiclassical model because although it does include some ideas of quantum mechanics it is not a full quantum mechanical description of the atom.
		In order to fully describe an atom we need to use the full theory of quantum mechanics, which was worked out by a number of people in the years following the Bohr model.
	www.sciencedaily.com /encyclopedia/bohr_model_1 (873 words)

	Encyclopedia: Atomic physics (Site not responding. Last check: 2007-10-17)
		Nuclear physics is the branch of physics concerned with the nucleus of the atom.
		The nucleus (atomic nucleus) is the center of an atom.
		The Bohr model of the atom The Bohr Model is a physical model that depicts the atom as a small positively charged nucleus with electrons in orbit at different levels, similar in structure to the solar system.
	www.nationmaster.com /encyclopedia/Atomic-physics (670 words)

	bohr's atom model -- bohr's atom model (Site not responding. Last check: 2007-10-17)
		Rutherford model of the atom, Bohr model of hydrogen.
		In the Bohr model of atom the energy of the state with principal quantum number of an electron in the Coulomb field of effective charge is As the ionization energy of the atom is, its effective...
		Model The Bohr Model of the Atom (or Modified Solar System Model): That model of the atom which succeeded the Rutherford Model of the Atom when it was unable to account for the discrete spectrum of...
	www.mratom.com /bohrsatommodel (3922 words)

	Links zur atom model Begriff
		This behavior is described in the Quantum Model of the atom.
		According to Bohr's model, the energy of the hydrogen atom in the nth state is expressed as:
		Below is a short sample of the essay "Brief History of the atom model.".
	www.suchoracle.de /suchoracle/atom_model.php (197 words)

	The Particle: Standing wave atom model
		The whole atom is a standing wave in three dimensions, and all known effects have to be described by electromagnetic standing wave geometry.
		Unlike the conventional model, where the space between electron shells is described as a void and empty space, in our model it is the space in between the inscribed and circumscribed spheres, which contain the inward and outward going spherical waves forming up the 3D standing wave shape.
		The Moon model is thus consistent with much of the same experimental data which underlies the periodic table of the elements, and explains additional features not explained by the modern, electron-configuration presentation of the periodic table.
	www.blazelabs.com /f-p-swave.asp (2951 words)

	The Bohr Atom (Site not responding. Last check: 2007-10-17)
		The orbital length of the nucleus in the binary mode is precisely 137 wavelengths of the proton.
		The orbital velocity derived from the relationships is: (.1191767 cm./sec.) So what we have is an electron-proton binary system, in which the path lengths of both "partners" is 137 wavelengths of the involved particles and the orbital velocities are as stated.
		One of the parameters of the nuclear orbital velocity is the mass of the proton.
	www.newphysics2000.org /bohr1.htm (3355 words)

	hybrid orbitals
		Both of these facts are difficult to immediately rationalize given the spatial arrangement of the valence orbitals in C (the 2s and the three 2p orbitals), and the fact that the 2s orbital is filled in the ground state of the carbon atom.
		The fundamental tenet of the HOM is that the atomic orbitals of differing energies will mix to form a new set of hybrid orbitals with energies determined by a weighted average of the atomic orbitals that combined.
		The hybrid orbital model is often used to explain the delocalized structures that arise when it is possible to draw multiple resonance structures for a molecule.
	www.wellesley.edu /Chemistry/chem120/hybrids.html (848 words)

	Chapter 15. Bohr's Model of the Hydrogen Atom
		It is successful for explaining the basic mechanics of the hydrogen atom and served as the basis for the quantum-mechanical theory, which succeeded it.
		Bohr stated that the electron in the hydrogen atom can be bound in a particular circular orbit, n, revolving about the proton, which is the atom's nucleus.
		When Bohr created his model, the majority of the magnitudes of the quantum attributes of a free electron had yet to be discovered.
	www.writword.com /unituniv/c15.htm (920 words)

	The Quantum Model of the Atom
		Fill the orbitals and sublevels as you move down the column
		The second electron to be placed in an orbital must have opposite spin and be drawn oppositely as the first electron
		The three p orbitals are positioned on the right, bottom, and left of the symbol (in that order)
	home.sc.rr.com /mikebennett/PhySci_Quantum_Model.html (322 words)

	The Modern Atom (Site not responding. Last check: 2007-10-17)
		model consistent with the spectroscopic data that show electrons can only exist in specific discrete energy levels.
		An electron of higher energy will most likely be found in an orbital that is different from the region that the electron will be found in when it is in a lower energy state.
		See an applet here that shows both the Bohr model of the atom and the Orbital model of the atoms as it absorbs and emits light.
	chemsite.lsrhs.net /c_AtomicTheory/modern_atom.html (248 words)

	Gravity & radiation pressure: Characteristic radiation
		This is a highly unnatural state for the target atom, and is corrected by an outer-shell electron falling into the hole in the K shell.
		The transition of an orbital electron from an outer shell to an inner shell is accompanied by the emission of an x-ray photon.
		A K-shell elctron is removed from a tungsten atom and is repleced by an L shell electron.
	www.blazelabs.com /f-g-rad.asp (488 words)

	Wave model
		Standing waves and atomic orbitals Quote: "...Electrons may or may not be particles, depending on when and where we look at them.
		When physicists tried to explain electron behavior in the atom, the equations - models - turned out to be describing standing waves.
		These POOP equations - what we call wave functions or better yet, orbitals - had four variables which changed depending on which electron, in which atom you were looking at.
	www.sciencedaily.com /encyclopedia/wave_model (322 words)

	Spiritual Secrets in the Carbon Atom
		At the beginning of the 19th century, John Dalton theorised that an atom was an indivisible particle of an element.
		In 1909, Ernest Rutherford showed that atoms were mostly empty space, revising the model of an atom to a tight positive nucleus containing the protons and neutrons with electrons around it; by 1913, Danish physicist Neils Bohr envisioned a planetary arrangement in which the electrons orbited the nucleus at different energy levels.
		In this model, each electron energy level is denoted by numbers that take concentric shells as suggested by the Bohr model because there are overlaps in the ordering of the energy levels.
	www.sol.com.au /kor/11_02.htm (857 words)

	Bohr's theory of the hydrogen atom (Site not responding. Last check: 2007-10-17)
		In that model, the negatively charged electrons revolve about the positively charged atomic nucleus because of the attractive electrostatic force according to Coulomb's law.
		Bohr's model of the hydrogen atom was only an intermediate step on the way to a precise theory of the atomic structure, which was made possible by quantum mechanics and quantum electrodynamics.
		Right down at the bottom you can read off the orbital radius r and the total energy E. If you try to vary the orbit's radius with pressed mouse button, this will generally lead to a non-stationary state.
	www.walter-fendt.de /ph11e/bohrh.htm (406 words)

	Bohr's Model of the Hydrogen Atom (Site not responding. Last check: 2007-10-17)
		Calculate the wavelength of light that corresponds to the transition of the electron from the n=4 to the n=2 state of the hydrogen atom.
		Bohr's model of the atom was important because it introduced quantized energy states for the electrons.
		However, as a model it was only useful for predicting the behavior of atoms with a single electron (H, He and Li ions).
	wine1.sb.fsu.edu /chm1045/notes/Struct/Bohr/Struct03.htm (955 words)

	Photon's&Bohr Atom (Site not responding. Last check: 2007-10-17)
		The subject of study is the Hydrogen Atom as it is the simplest and allows study of both the Bohr model and the Quantum model since there is only one energy shell.
		This process works in all atoms but we will be using the hydrogen model to demonstrate this.
		1 is the smallest orbit closest to the proton in the nucleus or center of the atom.
	www.ops.org /benson/2003_Physics_Class_Web_Site/ashleman/photons.htm (1853 words)

	Howstuffworks "How Atoms Work"
		The Bohr model could explain the spectra of atoms with one electron in the outer shell very well, but was not very good for those with more than one electron in the outer shell.
		Orbitals could be described as electron density clouds (see Atomic & Molecular Orbitals for a look at various orbitals).
		The resulting model of the atom is called the quantum model of the atom.
	www.howstuffworks.com /atom8.htm (937 words)

	Bohr Model of the Atom
		While the Bohr Model of the atom is primarily of historical interest to the working physicist, it displays the essential qualities of the atom as intuitively as possible.
		We start with a model of the atom which looks like a solar system: in place of the sun we have the positively charged nucleus, and instead of planets we have negatively charged electrons (see the next chapter).
		But Bohr's model leads to a decent agreement with experimental data (see Section C) and, as we shall see at the end of Chapter 9, it provides us with some clues to the nature of the electron itself.
	www.rwc.uc.edu /koehler/biophys/6a.html (714 words)

	Atomic physics (Site not responding. Last check: 2007-10-17)
		Lay people often associate the term atomic physics with nuclearpower and nuclear bombs, obviously due to the synonymous use of atomic and nuclear in standard English.
		The study of these lines led to the Bohr atom model and on to ourpresent understanding of the electron hull of the atom as described by the orbital atom model which is the basis of all understanding of chemistry.
		These conclusion are however not at all straight-forward but rather required more than a century ofresearch, which has succeeded on putting chemistry on a sound fundament but also gave rise to many other applications.
	www.therfcc.org /atomic-physics-23581.html (252 words)

	Quantum Mechanics and Atomic Orbitals (Site not responding. Last check: 2007-10-17)
		Departure from the Bohr model of the atom
		In the Bohr model, the electron is in a defined orbit, in the Schrödinger model we can speak only of probability distributions for a given energy level of the electron.
		Note that in the Bohr model we had the same energy for the electron in the ground state, but that it was described as being in a defined orbit.
	wine1.sb.fsu.edu /chm1045/notes/Struct/QMech/Struct05.htm (636 words)

	Bohr Model of Carbon Atom (Site not responding. Last check: 2007-10-17)
		C) are radioactive: in such isotopes, subatomic particles of one form or another are released, thus transforming the radioisotope into another form of atom.
		Electrons are found in orbitals, which may have rather complex shapes.
		However, it is convenient to think of electrons as existing in shells (also called energy levels) and exhibiting potential energy quantities related to the shells they occupy.
	tidepool.st.usm.edu /crswr/carbonatom.html (383 words)

	What is Photoelectron Spectroscopy?
		Photoelectron spectroscopy has served as a particularly important basis for the bonding models used to describe organic, inorganic, and organometallic molecules because the energetics of ion formation from the neutral ground state are directly related to orbital electron configurations, oxidation states, charge distributions, and covalency.
		Koopmans’ theorem is implicated whenever an orbital picture is involved, but is not necessary when the focus is on the total electronic states of the positive ions.
		Core ionizations of molecules are associated with the individual atoms present and fall in characteristic energy ranges related to the specific elements.
	www.chem.arizona.edu /facilities/pes/facility/PES_description.htm (868 words)

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