2.4- Three types of chemical bonds are ionic, covalent, and hydrogen
covalent bond
A chemical *bond* that occurs when atoms *share electrons* -The strongest chemical bond
ionic bond
A chemical *bond* that occurs when atoms *transfer electrons*. -Generally produce salt crystals -produces medium strength level bond
Dipole
A molecule that has two poles (one end is positive, the other negative).
Nonpolar covalent
A type of *bond* that forms when electrons are *shared equally.*
hydrogen bond
Chemical *bond* that occurs as weak *attraction between dipoles*. -is the cause of water surface tension -weakest bond -more an attraction than a bond
valence shell
The *outermost* energy shell of an atom; contains the valence electrons involved in the chemical reactions of that atom.
octet rule (rule of eights)
The tendency of atoms to interact in such a way that they have eight electrons in their valence shell.
Polar covalent
a type of *bond* that forms when electrons are *not shared equally* - Generally produces dipoles (one end is positive, the other negative)
electron shells (energy levels)
these surround the nucleus of an atom; the electrons are located here.
Chemical bond
this is force that holds two atoms together.