CH-1010 Lecture Notes - Lecture 4: Lone Pair, Vsepr Theory, Covalent Bond

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emeraldmammoth217

15 Mar 2018

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Draw lewis dot structure (predicts ve around central atom) Count the electron domains (high e density) a. b. A nonbonding lone pair counts as a single region. Predict the arrangement of electron domains= electron geometry. Predict molecular shape from domain arrangement and type = molecular shape/geometr. Electron geometry: the arrangement of the electron pairs (non-bonding and bonding) around the central atom. Molecular shape: refers to the arrangment of the different domains around the central atom in the molecule or ion. Non-bonding pairs of electrons are not part of the molecular geometry but they influence it. Multiple molecular shapes may be possible for a single electron geometry. Central atom and two domains of high electron density arranged in straight line. Three domains of high electron density directed at the corners of an equilateral triangle. Four domains of high electron density arranges at the corners of a tetrahedron (pyramid) Three domains directed at corner of an equilateral triangle.

Related Questions

Predict the molecular shape of using VSEPR theory.

Draw for yourself the best Lewis structure.
Count the number of electron groups (bond pairs and lone pairs, with multiple counting as one effective electron group) around the central atom, Answer

To establish the electron-group arrangement, Answer. From the electron-group arrangement, you can determine the hybridization of the central atom to be Answer

The electron-group arrangement is not (necessarily) the same as the molecular shape, which is named on the basis of the arrangement of atoms. The molecular shape is Answer
The ideal bond angles around the central atom are Answer. By analyzing repulsive forces between electron pairs (both lone pairs and bond pairs) and realizing that only bond angles subtended by atoms (not lone pairs) can actually be observed, you can predict if any deviations will occur; the experimental bond angles around the central atom will be Answer the ideal bond angles.
Taking the vector sum of bond dipoles, you can evaluate the net dipole moment and predict that the molecule will be Answer

sapphirecrow883

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