Tuesday, October 27, 2009

Van der Waals Bond Definition

Definition: A van der Waals bond is a secondary interatomic bond between adjacent molecular dipoles. A van der Waals bond may be permanent or induced.

Hydrogen Bond Definition - Chemistry Glossary Definition of Hydrogen Bond
Definition: A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule. A hydrogen bond tends to be stronger than van der Waals forces, but weaker than covalent bonds or ionic bonds.

This is a basic diagram
of an atom, with protons,
neutrons and electrons labeled.

Atom Definition: An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons circling this nucleus.

Atom Examples: hydrogen, carbon-14, zinc, cesium, Cl- (a substance can be an atom and an isotope or ion at the same time)

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