A compound with two or more atoms held together by covalent bonds

A pair of electrons that is not involved in bonding and that belongs exclusively to one atom.

A molecule that consists of two atoms of the same element

A compound that is composed of molecules.

In forming compounds, atoms tend to achieve the electron configuration of a noble gas.

A chemical bond resulting from electrostatic force attracting oppositely charged ions.

A compound composed of positive and negative ions that are combined so that the numbers of positive and negative charges are equal

The lowest whole-number ratio of ions in an ionic compound.

Shows the elements in the compound and the ratio of atoms.

The amount of energy required to break apart a mole of ions or molecules into its component atoms.

The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Units of energy.

Electrons in the outermost energy level of an atom.