Problem 45 - Chemistry: The Central Science

Question

(a) What is meant by the term orbital overlap? (b) Describe what a chemical bond is in terms of electron density between two atoms.

Step-by-Step Solution

Answer

(a) Orbital overlap is the interaction between the atomic orbitals of two adjacent atoms, occurring in a spatial region, leading to the formation of molecular orbitals and chemical bonds. (b) A chemical bond in terms of electron density is the region of increased electron density between two atoms due to their interaction and partial sharing of electrons, which stabilizes the system and holds the atoms together.

Step 1: (a) Orbital Overlap Definition

Orbital overlap refers to the spatial region where the wave functions (orbitals) of two adjacent atoms come together and interact. The atomic orbitals of individual atoms overlap with each other, resulting in the formation of a new type of orbital, known as a molecular orbital. The overlapping region has a higher probability of finding electrons, as they are shared between the two atoms. This interaction leads to the formation of chemical bonds in molecules.

Step 2: (b) Chemical Bond Definition in Terms of Electron Density

A chemical bond in terms of electron density can be described as the region where the electron density is higher between two atoms, due to their interaction and partial sharing of electrons in their respective orbitals. As the atoms approach each other, their atomic orbitals start to overlap, resulting in an increase in electron density between them. This increased electron density stabilizes the system, as it reduces the potential energy between the atoms and holds them together, forming a chemical bond.