Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure

Problem 40

Chapter 8, Problem 40

How many charge clouds are there around the central atom in molecules that have the following geometry?(a) Tetrahedral (b) Octahedral(c) Bent (d) Linear(e) Square pyramidal (f) Trigonal pyramidal

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Identify the central atom in each molecular geometry and consider all regions of electron density (bonds and lone pairs) around it as charge clouds.

For a tetrahedral geometry, recognize that it involves four bonds and no lone pairs on the central atom, resulting in four charge clouds.

In an octahedral geometry, note that there are six bonds and no lone pairs on the central atom, leading to six charge clouds.

Consider a bent molecular geometry, which typically arises from a trigonal planar arrangement with one lone pair or a tetrahedral arrangement with two lone pairs. Count the total number of bonds and lone pairs to determine the charge clouds.

For linear and square pyramidal geometries, count the number of bonds and lone pairs around the central atom. Linear typically has two charge clouds (two bonds or one bond and one lone pair), while square pyramidal has five bonds and no lone pairs, resulting in five charge clouds.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) Theory is a model used to predict the geometry of molecules based on the repulsion between electron pairs around a central atom. According to this theory, electron pairs, whether bonding or lone pairs, will arrange themselves to minimize repulsion, leading to specific molecular shapes.

Electron Cloud

An electron cloud refers to the regions around a central atom where electrons are likely to be found. In the context of molecular geometry, each region of electron density, including bonding pairs and lone pairs, is considered a 'charge cloud' that influences the spatial arrangement of atoms in a molecule.

Molecular Geometry

Molecular geometry describes the three-dimensional arrangement of atoms in a molecule. Different geometries, such as tetrahedral, octahedral, bent, linear, square pyramidal, and trigonal pyramidal, arise from the number and arrangement of charge clouds around the central atom, affecting the molecule's shape and properties.

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