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Covalent bond

	NationMaster - Encyclopedia: Valence bond theory
		A valence bond structure is similar to a Lewis structure, however where a single Lewis structure cannot be written, several valence bond structures are used.
		Electron atomic and molecular orbitals, showing among others the sigma bond of two s-orbitals and a sigma bond of two p-orbitals In chemistry, sigma bonds (Ïƒ bonds) are a type of covalent chemical bond.
		Electron atomic and molecular orbitals, showing a Pi-bond at the bottom right of the picture In chemistry, pi bonds (Ï€ bonds) are bonds with a single nodal plane containing the line segment between the two atoms.
	www.nationmaster.com /encyclopedia/Valence-bond-theory (1794 words)

	#1 Site For Learning Chemistry
		The electronic configuration of Na has 2 electrons in the first orbit (K shell), 8 electrons in the second orbit (L shell) and only one electron in the third (M shell).
		The electronic configuration of Cl has 2 electrons in the K shell, 8 electrons in the L shell and 7 electrons in the M shell.
		The ion that looses an electron is called a positive ion or a cation.
	home.att.net /~cat6a/form_comp-I.htm (618 words)

	Lewis Structure and Resonance
		The rule to build the Lewis Structure is based on chemists' experience: The most important requirement for the formation of a stable compound is that atoms achieve noble gas electron configurations by sharing electrons with other atoms, i.e.
		It is also called Lewis Dot Symbol, which consists of the symbol of an element and one dot for each valence electron in an atom of the element.
		For some molecules, the resonance structures are needed to correctly describe the electronic structure of the molecule.
	www.molecularsoft.com /help/Chemical_Bonds-Lewis_Structure.htm (871 words)

	Lewis structure - Wikipedia, the free encyclopedia
		Lewis structures, also called electron-dot structures or electron-dot diagrams, are diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that may exist in the molecule.
		Non-valence electrons are not represented in Lewis structures.
		Electrons in covalent bonds are split equally between the atoms involved in the bond.
	en.wikipedia.org /wiki/Electron_Dot_Structure (2074 words)

	Lewis Structures
		The Lewis Structure (electron dot diagram) of each ion is used to construct the Lewis Structure (electron dot diagram) for the ionic compound.
		In a covalent compound, electrons are shared between atoms to form a covalent bond in order that each atom in the compound has a share in the number of electrons required to provide a stable, Noble Gas, electronic configuration.
		Electrons in the Lewis Structure (electron dot diagram) are paired to show the bonding pair of electrons.
	www.ausetute.com.au /lewisstr.html (474 words)

	VSEPR
		Because electrons tend to pair with one another if their spins are opposed, we can modify the idea to say that pairs of electrons tend to adopt a geometry that minimizes repulsions.
		The geometry is determined by the tendency of the electron pairs around the central atom to minimize repulsions.
		For example, even though the geometry of the electron pairs around the oxygen in water is tetrahedral, it is the position of the atoms that leads to the description of bent for the geometry of water.
	wulfenite.fandm.edu /Intro_to_Chem/vsepr.htm (446 words)

	Lewis Structures
		Electron dot formulation also referred to as Lewis Dot Structures seek to symbolize the atom as a symbol representing what is called the "core" which involves the nucleus and all but the valence outermost electrons.
		Hydrogen Lewis dot structure would be the letter H with one dot.
		Lewis structures are used to identify symbolically the structure of molecules and the type of co-valent bonding exhibited in molecular substances.
	members.aol.com /profchm/lewis.html (1810 words)

	Electron Dot Structures
		Electron dot structure - valence electrons are represented by dots placed around the chemical symbol.
		Electrons are placed up to two on each side of the elemental symbol for a maximum of eight, which is the number of electrons in a filled s and p shell.
		Electrons in bonds are considering in counting the electrons in both atoms involved in the bond.
	www.uoregon.edu /~ch111/L12.htm (396 words)

	General Chemistry Online: Glossary: Chemical bonds
		For example, a hydrogen chloride (HCl) molecule is an electric dipole because bonding electrons are on average closer to the chlorine atom than the hydrogen, producing a partial positive charge on the H end and a partial negative charge on the Cl end.
		If electron density at a particular point in a molecule is higher or lower than what you'd expect from a single Lewis structure, and various canonical structures can be drawn to show how electron delocalization will explain the discrepancy, the difference in electron density is called a "resonance effect" or "mesomeric effect".
		Electrons that can be actively involved in chemical change; usually electrons in the shell with the highest value of n.
	antoine.frostburg.edu /chem/senese/101/bonds/glossary.shtml (1189 words)

	Research News:
		On the contrary, the dielectric function of a quantum dot, measured on the microscopic scale, is virtually the same as that of the bulk material -- except near the dot's surface.
		In the smaller dots, measurements near the center of the dot were still similar to the bulk measurements -- but varied significantly where the perturbation vanishes, near the surface.
		Measured microscopically, the dielectric function inside a quantum dot is the same as it is in the bulk material; measurements near a perturbation in the center of the dot show no significant difference, but in a small dot the differences are large near the boundary.
	www.lbl.gov /Science-Articles/Archive/Quantum-Dot-Electronics.html (1385 words)

	Template
		Drawing C is a Lewis electron dot structure for methane.
		Remember that the valence of an atom is the difference between the number of electrons in its valence shell and the number of electrons in the corresponding filled shell.
		The structure of glacin B is shown in Figure 8.
	www.usm.maine.edu /~newton/Chy251_253/Lectures/LewisStructures/LewisStructures.html (1242 words)

	[No title]
		Electron Dot Structures Lewis dot structures are used to indicate chemical bonds.
		The electron dot structure of ionic compound is simply The metal ions with their proper charges with no dots The non-metal ions with their proper charges and 8 dots Examples: NaCl CaBr2 Al2O3 B.
		The number of valence electrons (dots) in ammonium ion is (5 + 4) -1 = 8 If the ion has negative charge, we add the value of the negative charge to the number of valence electrons.
	www.siue.edu /~jshen/CH120/CH120CH5.doc (1722 words)

	Unit 3: Chemical Bonding
		The dots represents the valence electrons (the outermost electrons in the atom that are used for chemical bonding) of an element.
		For example, sodium (Na) has one electron around it, potassium (K) has one valence electron (one dot), and the same holds for the remaining elements in the family.
		To represent HF in terms of Lewis dot structures, we would write H with a dot on the right side, and F with a dot on the left side, two dots on the top side, two dots on the right side, and two dots on the bottom.
	library.thinkquest.org /3310/lographics/textbook/u03s02.html (954 words)

	Chemical Bonding Topic Overview
		Elements whose atoms have relatively few valence electrons are typically metals, while those with relatively large numbers of valence electrons are typically nonmetals.
		Electron pair sharing is typical of nonmetals and is best illustrated for the hydrogen molecule, a case of "equal sharing." Two isolated hydrogen atoms have only one electron each.
		As the atoms approach each other, the electron of one atom is attracted by the nucleus of the other atom, and vice versa.
	www.okstate.edu /jgelder/bondpage2.html (520 words)

	Chapter 16 - Covalent Bonding
		The electrons appear to be 90o apart because this is a two-dimensional representation of a three-dimensional object.
		This unshared pair of electrons is known as a lone pair or electrons or a nonbonding pair of electrons.
		Since the single lone pair of electrons associated with the nitrogen atom exerts a repulsive force greater than that of the three bonding pairs of electrons in the ammonia molecule, the nitrogen-hydrogen bonds are “pushed downward” and the angle is slightly smaller than in the normal tetrahedral molecule.
	pages.prodigy.net /anderhan/Ch16Bonding.html (4773 words)

	Writing of Lewis Electron-Dot Structures (Site not responding. Last check: )
		1. From the Periodic Table, determine the number of electrons in the valence shell of the atom that you are drawing an electron-dot structure for.
		3. Sum the valence electrons of all the atoms composing the molecule.
		7. Distribute the remaining electrons as dots around the atoms bound to the central atom in a manner that satisfies the octet rule.
	staff.imsa.edu /science/chemistry/web/lewisdothandout.htm (1018 words)

	Chemistry Lewis Dot structure
		The structure of carbon and its compound can be expressed using the Lewis-dot structure This system identifies how the atoms that compose a molecule of a specific compound are attached (bonded) to one another and (to some extent) oriented in space.
		An atom is indicated by its symbol with a number of dots representing the number of valency electrons e.g Hydrogen would be H with a single dot, Carbon would be a C with four dots.
		For a monoatomic ion, the electronic configuration of the ion represents the correct Lewis structure.
	www.roymech.co.uk /Related/Chemistry/Lewis_dot_structure.html (799 words)

	Glencoe Online Science Quiz Chapter
		The principle that states each electron occupies the lowest energy orbital available is the ______________.
		An element symbol surrounded by dots representing its valence electrons.
		The total number of electrons in s orbitals in a germanium atom is ________.
	www.glencoe.com /qe/scienceOLC.php?qi=6241 (154 words)

	Lewis Dot Structures Copy Right by C. Chieh, UoWaterloo
		Lewis dot structures are useful in explaining the chemical bonding in molecules or ions.
		When several structures with different electron distributions among the bonds are possible, all structures contribute to the electronic structure of the molecule.
		For resonance structures, the skeleton of the molecule (or ion) stays in the same relative position, and only distributions of electrons in the resonance structures are different.
	www.science.uwaterloo.ca /~cchieh/cact/c120/dotstruc.html (1561 words)

	Name ___________________________
		Describe and explain the trends in the periodic table for the atomic radius.
		electron configuration, specify the principal and secondary quantum numbers and possible values for the magnetic and spin quantum numbers.
		Using Slater’s rules, calculate the effective nuclear charge for a 3d electron in Fe.
	www.cbu.edu /~mcondren/C422e197.htm (371 words)

	lewis.htm
		If the central atom has an even number of valence electrons and an odd number of atoms are surrounding that atom, don't leave an unpaired electron on the central atom.
		Once the electron dot structure is complete, translate the this structure into a Lewis structure.
		Two electrons are shared between two atoms constitutes a single bond; four electrons shared is a double bond, and six electrons shared is a triple bond.
	www.towson.edu /~ladon/lewis.html (496 words)

	Defintion of lewis_formula_electron_dot_or_lewis_structure - Chemistry Dictionary
		Molecular structure in which the valency electrons are shown as dots so placed between the bonded atoms that one pair of dots represents two electrons or one (single) covalent bond, e.g.
		A double bond is represented by two pairs of dots, etc. Dots representing non-bonded outer-shell electrons are placed adjacent to the atoms with which they are associated, but not between the atoms.
		+, -, 2+, etc.) are attached to atoms to indicate the difference between the positive nuclear charge (atomic number) and the total number of electrons (including those in the inner shells), on the formal basis that bonding electrons are shared equally between atoms they join.
	www.chemicool.com /definition/lewis_formula_electron_dot_or_lewis_structure.html (149 words)

	Panload articles Reference & Education Chemistry Panload.com
		Electrons orbit atoms in clouds of distinct shapes and sizes.
		The electron clouds are layered one inside the other into units called shells (think nested Russian dolls), with the electrons occupying the smallest, innermost shell having the lowest energy state and the electrons in
		The octet rule refers to the tendency of atoms to prefer to have eight electrons in their valence shell.The main exception to the rule is hydrogen, which is at lowest energy when it has two electrons in its valence shell.
	www.panload.com /list_details.php?id=11&sub=Chemistry (953 words)

	Lewis electron-dot symbols
		His method rests upon focusing on the valence electrons of the elements.
		He represents these valence electrons as "dots" around the four sides of the elemental symbol.
		Recall, it is the valence electrons that are involved in most chemical reactions.
	www.iun.edu /~cpanhd/C101webnotes/chemical-bond/lewis-electron-dot.html (82 words)

	JCE 2003 (80) 711 [Jun] Writing Electron Dot Structures
		Writing Electron Dot Structures is a computer program for Mac OS and Windows that provides drill with feedback for students learning to write electron dot structures.
		During the construction of a structure, students have the option of quitting, selecting another formula, or returning to a previous step.
		Remaining electrons are added to complete the formation of multiple bonds, assure compliance with the octet rule, and form expanded octets.
	jchemed.chem.wisc.edu /Journal/Issues/2003/Jun/abs711_2.html (463 words)

	Chemical Bonding
		Pauling devised a measure of this electron attracting power which he called "electronegativity" which he defined as the "power of an atom in a molecule to attract electrons to itself." Electronegativity only has meaning in a bond.
		This effect is due to the intervention of the d electrons and other effects that come into play with very large atoms.
		Draw Lewis structures for all compounds that obey the octet.
	www.lancaster.k12.oh.us /joe_didomenico/chem_honors/chpt12/bonding_lesson.htm (792 words)

	Lesson 3-8 Lewis Dot Diagrams (Site not responding. Last check: )
		Each dot diagram consists of; an elemental symbol, which represents the kernel of the atom, and a group of 1-8 dots which shows the configuration of the outer-most electron shell of the atom, also called the valence shell.
		When Lewis dot diagrams are used for compounds, "x's" are often used to substitute for the dots of one or more elements in order to show which electrons came from which element.
		Remember that the dots represent the electrons that are found in the valence shell, or energy level with the highest value for n (principle quantum number).
	www.fordhamprep.org /gcurran/sho/sho/lessons/lesson38.htm (555 words)

	Search: diagram dot lewis
		the Lewis Structure (electron dot diagram) for the ionic compound.
		Lewis structure electron dot structure Lewis dot structure
		The electron dot (Lewis) of Na and Cl....
	www.angelfire.com /alt2/gci0/search4a0b.html (289 words)

	atomic concepts
		In the _________________ model (electron cloud model), the electrons are in ________, which are defined as the regions of the most probable electron location (ground state).
		When an electron, in an atom, gains a specific amount of energy, the electron is at a higher energy state (_______ state).
		When an electron returns from a higher energy state to a lower energy state, a specific amount of energy is _______.
	www.chemcool.com /regents/atomicconcepts/atomicconcepts.htm (1151 words)

	Valence Shell Electron Pair Repulsion Theory
		Since the Lewis Electron Dot Structure only shows the molecule in one dimension, we have no idea what the geometry is. To see this, we will have to look at the three dimensional model of the molecule.
		In this model, the electrons being shared by the central nitrogen and the fluorine atoms are represented by the single bonds.
		Adding the paired but unshared electrons from the nitrogen, the non-bonding pair, and also the faces of the pyramid formed by allowing the three fluorine atoms and the non-bonding pair to form the four vertices of the pyramid, the geometry of the nitrogen trifluoride molecule is shown to be trigonal pyramidal.
	www.chemvc.com /~tim/VSEPR.html (283 words)

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