In which of these molecules or ions does the presence of nonbonding electron pairs produce an effect on the molecular shape? (a) CO2, (b) CH2Br2, (c) OF2, (d) BCl3, (e) SF6.

Name: Chemistry: The Central Science
Author: Brown
ISBN: 9780134414232

검증된 단계별 안내

Step 1: Understand the concept of molecular shape and the role of nonbonding electron pairs. Nonbonding electron pairs, also known as lone pairs, can influence the geometry of a molecule by repelling bonding pairs of electrons, which can alter the molecular shape.

Step 2: Analyze each molecule or ion to determine the presence of nonbonding electron pairs on the central atom. Use the Lewis structure to identify lone pairs.

Step 3: For each molecule or ion, apply the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the molecular shape. VSEPR theory states that electron pairs around a central atom will arrange themselves to minimize repulsion, affecting the shape.

Step 4: Evaluate the effect of any nonbonding electron pairs on the molecular shape. Nonbonding pairs exert greater repulsive force than bonding pairs, potentially altering the expected geometry.

Step 5: Identify which molecules or ions have their molecular shape affected by nonbonding electron pairs based on your analysis.

주요 개념

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VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) Theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs in the valence shell of the central atom. According to this theory, electron pairs, whether bonding or nonbonding, will arrange themselves to minimize repulsion, thus influencing the overall shape of the molecule.

Nonbonding Electron Pairs

Nonbonding electron pairs, also known as lone pairs, are pairs of valence electrons that are not involved in bonding with other atoms. These lone pairs occupy space around the central atom and can significantly affect molecular geometry by repelling bonding pairs, leading to distortions in the expected shape of the molecule.

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. It is determined by the number of bonding pairs and lone pairs around the central atom, which influences bond angles and overall shape. Understanding molecular geometry is crucial for predicting the physical and chemical properties of substances.