Linear geometry electron

The Lewis formula predicts 2 electron groups around the central Be atom and a linear electronic geometry. There are no lone pairs on the Cd atom, so the molecular geometry is the same as the electronic geometry linear (Section 8-5). 

When there are two electron groups around the central atom, it is sp hybridized. AB2 molecules and ions with no lone pairs on the central atom have linear electronic geometry, linear molecular geometry, and sp hybridization on the central atom. 

The Lewis formula predicts 5 electron groups around the central I atom and a trigonal bipyramidal electronic geometry. This ionic geometry is linear. 

The adiabatic and vertical ionization potentials for Lis are very similar, both being approximately 3.95 eV. This results because of the similar geometries for the 82 state of LisCCsv) and the Ai state of Li3" (D3h). It must be noted, however, that the vertical ionization process for the removal of an electron from linear Lis to give linear Lis leads to the higher ionization potential, 4.39 eV. If both Csv and forms are present in an experiment, a complicated threshold dependence for the ionization process will be observed (j4). The results for Lis exemplify that the fluxional nature of a small metal cluster may complicate the experimental determination of electron affinities and ionization potentials. 

The VSEPR theory predicts the three-dimensional shapes of molecules. It is based on simple electrostatics—electron pairs in a molecule will arrange themselves in such a way as to minimize their mutual repulsion. The steric number determines the geometry of the electron pairs (linear, trigonal pyramidal, tetrahedral, and so forth), whereas the molecular geometry is determined by the arrangement of the nuclei and may be less symmetric than the geometry of the electron pairs. 

Linear Electronic Geometry AB2 Species (No Lone Pairs of Electrons on A)... 

LINEAR ELECTRONIC GEOMETRY AB2 SPECIES (NO LONE PAIRS OF ELECTRONS ON A)... 

Valence shell electron pair repulsion theory places the two electron pairs on Be 180° apart, that is, with linear electronic geometry. Both electron pairs are bonding pairs, so VSEPR also predicts a linear atomic arrangement, or linear molecular geometry, for BeCl2. 

The sp hybrid orbitals are described as linear orbitals, and we say that Be has linear electronic geometry. 

Linear A term used to describe the electronic geometry around a central atom that has two regions of high electron density. Also used to describe the molecular geometry of a molecule or polyatomic ion that has one atom in the center bonded to two atoms on opposite sides (180°) of the central atom (AB2 or AB2U3). 

What hybridization is associated with these electronic geometries trigonal planar linear tetrahedral octahedral trigonal bipyramidal ... 

NO shows a wide variety of coordination geometries (linear, bent, doubly bridging, triply bridging and quadruply bridging — see p. 453) and sometimes adopts more than one mode within the same complex. NO has one more electron than CO and often acts as a 3-electron donor — this is well illustrated by the following isoelectronic series of compounds in which successive replacement of CO by NO is compensated by a matching decrease in atomic number of the metal centre ... 

If the Lewis formula for a molecule or ion shows only one lone pair In linear, trigonal planar, tetrahedral, or octahedral electronic geometry, all positions are equivalent, so it doesn t matter where we place the lone pair. In trigonal bipyramidal electronic geometry, place the lone pair in the equatorial position where it is least crowded, and put the bonded atoms in the other positions. 

SECTION 9.5 To extend the ideas of valence-bond theory to polyatomic molecules, we must envision mixing s, p, and sometimes d orbitals to form hybrid orbitals. The process of hybridization leads to hybrid atomic orbitals that have a large lobe directed to overlap with orbitals on another atom to make a bond. Hybrid orbitals can also accommodate nonbonding pairs. A particular mode of hybridization can be associated with each of three common electron-domain geometries (linear = sp trigonal planar = sp -, tetrahedral = sp ). 

Removing an atom from the equatorial plane of the trigonal bipyramid in Figure 9.3 creates a seesaw shape. 93 (a) 2 electron-domain geometries, linear and trigonal bipyramidal (b) 1 electron-domain... 

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