How many electron pairs are shared when two carbon atoms...

Name: Problem 3, Chapter 19: Introductory Chemistry
Uploaded: 2021-03-31T15:42:35-08:00
Duration: 1 min 44 s
Channel: Vasu Makani
Description: How many electron pairs are shared when two carbon atoms form a double bond? What must be the geometric arrangement around the carbon atoms involved in a double bond? Give an example of a simple molecule in which there is a carbon-carbon double bond, and draw its Lewis structure.

How many electron pairs are shared when two carbon atoms form a double bond? What must be the geometric arrangement around the carbon atoms involved in a double bond? Give an example of a simple molecule in which there is a carbon-carbon double bond, and draw its Lewis structure.

Key Concepts

Double Bond

A double bond is a type of covalent bond where two pairs of electrons are shared between two atoms. It is typically comprised of one sigma bond and one pi bond, with the sigma bond forming by direct overlap of hybrid orbitals and the pi bond forming by side-by-side overlap of unhybridized p orbitals.

Electron Pair Sharing

Electron pair sharing is the process by which atoms achieve greater stability and fulfill their valence electron requirements. In a double bond, two pairs of electrons are shared, which helps both atoms reach a full octet and contributes to the overall bond strength.

Molecular Geometry

The molecular geometry around atoms involved in a double bond is generally trigonal planar. This arrangement stems from sp² hybridization of the double-bonded atoms, where three electron domains (one from the sigma bond of the double bond and two from additional bonds or lone pairs) are arranged in a plane to minimize electron repulsion.

Lewis Structures

Lewis structures are diagrams that show the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They are a useful tool for visualizing how atoms share electrons to form bonds, particularly in molecules with double bonds where the representation must clearly indicate the presence of two shared electron pairs between atoms.

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