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Topic: Electron configuration

Related Topics

Atomic electron configuration table

Atomic orbital

Azimuthal quantum number

Principal quantum number

Molecular orbital

Valence shell

Electron orbital

Ligand field theory

Pauli exclusion principle

Atom

Crystal field theory

Octet rule

Quantum number

Transition metal

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	Electron Configuration
		The electron configuration of an atom is the particular distribution of electrons among available shells.
		The number of electrons in an atom of an element is given by the atomic number of that element.
		With increasing atomic number, the electron configuration of the atoms display a periodic variation.
	library.thinkquest.org /10429/high/eleconfig/electron.htm (812 words)

	How do I read an electron configuration table?
		An electron configuration table is a type of code that describes how many electrons are in each energy level of an atom and how the electrons are arranged within each energy level.
		The total number of electrons in an energy level is the sum of the electrons in each sub-shell of that energy level.
		Use the electron configuration to find that atom's highest energy level and then add up the numbers in superscript to find the number of electrons that are in it.
	education.jlab.org /qa/electron_config.html (493 words)

	Quantum Numbers and Electron Configurations
		Electrons are added to a subshell with the same value of the spin quantum number until each orbital in the subshell has at least one electron.
		Electron configurations of the next two elements in the periodic table, for example, could be written as follows.
		When electron configuration data are arranged so that we can compare elements in one of the horizontal rows of the periodic table, we find that these rows typically correspond to the filling of a shell of orbitals.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch6/quantum.html (2581 words)

	Electron configuration - Wikipedia, the free encyclopedia
		Electron configuration is intimately related to the structure of the periodic table.
		The chemical properties of an atom are largely determined by the arrangement of the electrons in its outermost ("valence") shell (although other factors, such as atomic radius, atomic mass, and increased accessibility of additional electronic states also contribute to the chemistry of the elements as atomic size increases).
		The notion of electron configuration ceases to be relevant, and yields to band theory.
	en.wikipedia.org /wiki/Electron_configuration (1109 words)

	Electron shell - Wikipedia, the free encyclopedia
		In atomic physics, an electron shell, also known as a main energy level, is a group of atomic orbitals with the same value of the principal quantum number n.
		The name for electron shells originates from the Bohr model, in which groups of electrons were believed to orbit the nucleus at certain distances, so that their orbits formed "shells".
		Electron subshells are identified by the letters s, p, d, f, g, h, i, etc., corresponding to the azimuthal quantum numbers (l-values) 0, 1, 2, 3, 4, 5, 6, etc. Each shell can hold up to 2, 6, 10, 14, 18, 22 and 26 electrons respectively.
	en.wikipedia.org /wiki/Electron_shell (342 words)

	Electron configuration: Facts and details from Encyclopedia Topic (Site not responding. Last check: )
		In atomic physics, an electron orbital (or simply orbital) is the description of the behavior of an electron in an atom or molecule according...
		Electrons are fermion[Follow this hyperlink for a summary of this subject]s and are thus subject to the Pauli exclusion principle Pauli exclusion principle quick summary:
		The atomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in a atom that is at equilibrium....
	www.absoluteastronomy.com /encyclopedia/e/el/electron_configuration.htm (1745 words)

	ScienceDaily: Electron configuration (Site not responding. Last check: )
		In atomic physics, the electron configuration is the arrangement of electrons in an atom, molecule or other body.
		Electron configuration -- In atomic physics, the electron configuration is the arrangement of electrons in an atom, molecule or other body.
		Electron -- The Electron is a fundamental subatomic particle that carries an electric charge.
	www.sciencedaily.com /encyclopedia/Electron_configuration (1315 words)

	Wikipedia: Electron configuration
		In chemistry, the term "electron configuration" refers to the arrangement of electrons; as they "orbit" around the nuclei of one, or more, atoms.
		The first quantum number n corresponds to the overall energy and hence also the distance from the nucleus of an orbital, hence sets of states with the same n are often referred to as electron shells or energy levels.
		The fact that the 3d state is higher in energy than the 4s state but lower than the 4p is the reason for the existence of the transition metals.
	www.factbook.org /wikipedia/en/e/el/electron_configuration.html (887 words)

	Electron configuration and the Pascal Triangle
		The common character of theories of atomic constitution has been the endeavour to find configurations and motions of the electrons which would seem to offer an interpretation of the variations of the chemical properties of the elements with the atomic number as they are so clearly exhibited in the well-known periodic law.
		A consideration of this law leads directly to the view that the electrons atom are arranged in distinctly separate groups, each containing a number of electrons equal to one of the periods in the sequence of the elements, arranged according to increasing atomic number.
		The farther an electron shell is from nucleus, the larger it is.
	milan.milanovic.org /math/english/atom/electron.html (1123 words)

	Chemistry : Chapter 3 : Electron Configurations (Site not responding. Last check: )
		Electron configurations provide a list of all the electrons in an atom, with the principal quantum number, then the angular momentum quantum number (as a letter), then the number of electrons with those quantum numbers as a superscript.
		The electron configuration of the atom Pb is [Xe]6s
		The electron configuration of the atom I is [Xe]6s
	www.wwnorton.com /chemistry/concepts/chapter3/ch3_3.htm (1297 words)

	[No title] (Site not responding. Last check: )
		The electron configuration of an atom describes the orbitals occupied by electrons on the atom.
		The basis of this prediction is a rule known as the aufbau principle, which assumes that electrons are added to an atom, one at a time, starting with the lowest energy orbital, until all of the electrons have been placed in an appropriate orbital.
		To write the electron configurations of atoms, you need to know the order in which the different electron sublevels are filled.
	www.lycos.com /info/electron-configuration--atom.html (365 words)

	Atomic electron configurations
		Wolfgang Pauli's 1935 statement of the exclusion principle was the final critical step for understanging atomic electron configurations, and hence the structure of the periodic table.
		The fact that electrons preferentially fill the lowest-energy empty orbitals is the basis of the rules for determining the electron configuration of the elements and of the structure of the periodic table.
		Inspection of a table of electron configurations of the elements reveals a few apparent non-uniformities in the filling of the orbitals, as is illustrated here for the elements of the so-called first transition series in which the 3d orbitals are being populated.
	www.chem1.com /acad/webtext/atoms/atpt-5.html (1795 words)

	Chapter 7B
		An electron configuration is a description of electron arrangement within an atom, which indicates both population and location of electrons among the various atomic orbitals.
		Valance electrons are the electrons in the outermost principal quantum level.
		To write the ground state electron configuration of a cation, remove electrons from the highest occupied energy level in the ground state electron configuration of the atom.
	www.chem.latech.edu /~deddy/Lectnote/Chap7B.html (1409 words)

	Bambooweb: Electron configuration
		Since electrons are fermions they are subject to the Pauli exclusion principle, which states that no two fermions can occupy the same quantum state at once.
		This is the fundamental basis of the configuration of electrons in an atom: once a state is occupied by an electron, the next electron must occupy a different quantum mechanical state.
		The chemical properties of an atom are largely determined by the arrangement of the electrons in its outermost ("valence") shell (although other factors, such as atomic radius, atomic mass, and increased accessibility of additional electronic states also contribute to the chemistry of the elements as atomic size increases).
	www.bambooweb.com /articles/e/l/Electron_configuration.html (886 words)

	Electron Configurations
		When physicists developed an understanding of how atoms were constructed (particularly the configuration of the electrons), it was possible to relate that structure to the periodic table (particularly the long form).
		The point here is to emphasize some of the patterns that exist in the relationship between the electron configurations of the elements and the location of the elements on the periodic table and even the shape of the periodic table.
		Keep adding electrons to that pattern until you have reached what you know to be the end of the electron configuration for that element based on its location on the periodic table.
	dl.clackamas.cc.or.us /ch104bk/lesson7/electron.htm (1660 words)

	SparkNotes: Organic Atomic Structure: Electron Configuration and Valence Electrons
		The outermost shell of an atom is its valence shell, and the electrons in the valence shell are valence electrons.
		While inner electrons (those not in the valence shell) typically don't participate in chemical bonding and reactions, valence electrons can be gained, lost, or shared to form chemical bonds.
		The electron configurations for the first and second row elements are shown in figure 2.2 in simplified notation.
	www.sparknotes.com /chemistry/organic1/atomicstructure/section2.rhtml (566 words)

	Electron Configurations (Site not responding. Last check: )
		Electrons having opposite spins are said to be "paired" electrons, as with the electrons occupying the Li 1s orbital
		Electronic configurations can also be written in a short hand which references the last completed orbital shell (i.e.
		The electrons in the stable (Noble gas) configuration are termed the core electrons
	wine1.sb.fsu.edu /chm1045/notes/Struct/EConfig/Struct08.htm (617 words)

	Electron Configurations & The Periodic Table
		In the third period of the table, the atoms all have a neon-like core of 10 electrons, and shell #3 is occupied progressively with eight electrons, starting with the 3s-orbital.
		Transfer of the lone 3s electron of a sodium atom to the half-filled 3p orbital of a chlorine atom generates a sodium cation (neon valence shell) and a chloride anion (argon valence shell).
		These electron sharing diagrams (Lewis formulas) are a useful first step in understanding covalent bonding, but it is quicker and easier to draw Couper-Kekulé formulas in which each shared electron pair is represented by a line between the atom symbols.
	www.cem.msu.edu /~reusch/VirtualText/intro2.htm (2116 words)

	Electron Configuration of Atoms on the Periodic Table (Site not responding. Last check: )
		I chose electron configuration because it is a topic in chemistry that lends itself to complex visualization.
		Negatively charged electrons (raisins) were stuck in the middle of a lump of positively charged protons (the pudding).
		The electron configuration of any atom may be written by reading the periodic table from left to right in order of increasing atomic number and by correlating the areas in the chart with the various sublevels.
	www.uh.edu /hti/cu/1999/v02/07.htm (2623 words)

	Quantum Numbers (Site not responding. Last check: )
		One of the key insights in quantum chemistry is that, because an electron is not a classical particle located at a definite point in space, even a single electron can "surround" the nucleus of an atom, filling a volume roughly as big as the whole atom.
		Each individual electron cloud extends down to "touch" the nucleus, and all the electrons in an atom come under the direct influence of the nucleus, although some are influenced more strongly than others.
		in the electron configuration for chlorine above indicates its location as the fifth square in the p sublevel on the third row of the periodic table.
	www.howe.k12.ok.us /~jimaskew/cquantum.htm (955 words)

	SparkNotes: Atomic Structure: Electron Configuration and Valence Electrons
		The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
		Valence electrons are the highest energy electrons in an atom and are therefore the most reactive.
		The electron configurations of the first ten elements are shown below (note that the valence electrons are the electron in highest energy shell, not just the electrons in the highest energy subshell).
	www.sparknotes.com /chemistry/fundamentals/atomicstructure/section2.rhtml (983 words)

	Lewis Dot Diagrams of the Elements
		As electrons are added, they fill electron shells in an order determined by which configuration will give the lowest possible energy.
		In the periodic table, the elements are placed in "periods" and arranged left to right in the order of filling of electrons in the outer shell.
		The number of electrons in a given shell can be predicted from the quantum numbers associated with that shell along with the Pauli exclusion principle.
	hyperphysics.phy-astr.gsu.edu /hbase/pertab/perlewis.html (190 words)

	Writing Electron Configurations
		The main goal of this module is to be able to write the electron configurations for atoms and ions.
		An electron configuration shows how the electrons are divided up among the orbitals in an atom.
		We can use a shorthand to indicate all of the electrons that are identical to helium's configuration by putting He in square brackets, and substituting it for those electrons.
	www.brazosport.cc.tx.us /~chem/tutor/elecconf.html (1066 words)

	General Chemistry Online: Companion Notes: Electrons in atoms
		The quantum theory was used to show how the wavelike behavior of electrons leads to quantized energy states when the electrons are bound or trapped.
		Electrons in atoms are bound to the nucleus by electrostatic attraction
		is an electron configuration with 15 electrons total; 2 electrons have n=1 (in the 1s subshell); 8 electrons have n=2 (2 in the 2s subshell, and 6 in the 2p subshell); and 5 electrons have n=3 (2 in the 3s subshell, and 3 in the 3p subshell).
	antoine.frostburg.edu /chem/senese/101/electrons/index.shtml (1052 words)

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