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Excitons trapped at impurity centers in highly ionic crystals were first described by McClure and Pédrini [Phys. Rev. B 32, 8465 (1985)] as excited states consisting of a bound electron-hole pair with the hole localized on the impurity and the electron on nearby lattice sites, and a very short impurity-ligand bond length.

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May 02, 2011 · A lone pair is counted in a specific way in VSPER geometry, depending on if you are counting electronic geometry or molecular. I'm betting your answer is trigonal pyramidal because you have 3 bonds and 1 lone pair. That's a tetrahedral geometry (4 bonds total) but 3 + 1 lone pair makes it trig. pyramidal.

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Electron Group Geometry Number of Lone Pairs Molecular Geometry Approximate Bond Angles Example Compound 2 Linear 0 Linear 2 180 o carbon dioxide, CO 3 Trigonal Planar 0 Trigonal Planar 120 o formaldehyde, CH 2O 4 Tetrahedral 0 Tetrahedral 109.5 o methane, CH 4 4 Tetrahedral 1 Trigonal Pyramid 107 o ammonia, NH 3 4 Tetrahedral 2 Angular (Bent)

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Electron Group Geometry Number of Lone Pairs Molecular Geometry Approximate Bond Angles Example Compound 2 Linear 0 Linear 2 180 o carbon dioxide, CO 3 Trigonal Planar 0 Trigonal Planar 120 o formaldehyde, CH 2O 4 Tetrahedral 0 Tetrahedral 109.5 o methane, CH 4 4 Tetrahedral 1 Trigonal Pyramid 107 o ammonia, NH 3 4 Tetrahedral 2 Angular (Bent) Titanium L 3,2 and O K electron energy loss near-edge structures (ELNES) of seven Ti oxides have been measured in a transmission electron microscope to obtain information on the valence state and site geometry of Ti. The coordination of Ti in all phases studied is octahedral, whereas the valence states occurring are Ti 2+, Ti 3+, and Ti 4+.

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Molecular Geometry from Trigonal Planar Electron Domain Geometry AB 2 E: bent – start with AB 3 molecule (trigonal planar) and replace a B atom w/ lone pair – lone pair electrons push bonding electrons away bond angles are now less than 120° Molecular Geometries from Tetrahedral Electron Domain Geometry AB 3

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This will be THE IDEALIZED ELECTRON GROUP GEOMETRY. The GEOMETRY OF THE MOLECULE is conventionally considered to be the GEOMETRY of the ATOMS, NOT THE GEOMETRY OF THE ELECTRON GROUPS. Thus, the IDEAL MOLECULAR GEOMETRY of OF 2 is BENT with a < FOF = 109° 27' Methane, CH 4, ammonia, NH 3, the ammonium ion, [NH 4] + and the nitranion (amide ion), [NH 2] –, [above] all have eight electrons in the valence shell of the central atom and all have a total coordination number of 4. Fifth: The overall geometry of the atomic centre is determined by the mutual repulsion between the electron pairs of the ...

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