¨The alkali metals are located in Group IA (first column) of the periodic table. Sodium and potassium are examples of these elements.

¨Most elements are metals. There are so many metals, they are divided into groups: alkali metals, alkaline earth metals, and transition metals. The transition metals can be divided into smaller groups, such as the lanthanides and actinides.

¨You see metals every day. Aluminum foil is a metal. Gold and silver are metals.

sets of groups. The group A elements are called the representative elements. The group B elements are the nonrepresentative elements.

elements that have the same outer electron arrangement.

Colums of elements help define element groups. Elements within a group share sevrrel common proporties.

The period number  of an element significs the highest element.  The number of elements in a pereodic table increases as you moove down the periodic table because there more  sub leveles per level as the energy level of the atom increases.