2.4 The three types of chemical bonds are ionic, covalent, and hydrogen.

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ion

A charged atom

covalent bond

A chemical bond that involves sharing a pair of electrons between atoms in a molecule

polar molecule

A molecule that has electrically charged areas. (ex. water)

anion

A negatively charged ion

cation

A positively charged ion

electron shells

An energy level representing the distance of an electron from the nucleus of an atom.

nonpolar molecules

Electrically balanced molecules.

ionic bond

Formed when one or more electrons are transferred from one atom to another

octet rule (or rule of eights)

The tendency of atoms to interact in such a way that they have eight electrons in their valence shell.

dipole

a molecule that has two poles, or regions, with opposite charges (like water)

electropositive

atoms with less electron-attracting ability

electronegativity

electron-hungry , attract electrons very strongly

crystals

large arrays of cations and anions held together by ionic bonds

valence shell

outermost electron shell

chemical bonds

the attractive forces that hold atoms together

energy level

the specific amount of energy an electron has (used interchangeably with "electron shell")


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