Compounds (referred to as molecules) form between two different elements.

Chemical bonds can be ionic or covalent.

Ionic bonds form between a metal and a nonmetal.

Covalent bonds form between two or more nonmetals.

Covalent bonds can be either polar covalent or nonpolar covalent.

Elements are made of one atom, making them pure. As a result, the pure element cannot be broken down.

Elements on the periodic table are classified as either metals or nonmetals based upon their positions or place on the periodic table.

Compounds are formed by combining two or more elements.

Covalent bonds share electrons, while ionic bonds either gain or lose electrons.

Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.