Trends in the Periodic Table

Periodic Law: when elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.

The vertical columns are called families or groups
the horizontal rows are called periods.

the first group are alkali metals, the second group is alkaline earth metals.

atomic radius decreases as it moves to the right

metallic properties also decrease the farther right you go

the last two groups are halogens and noble gasses

the most reactive metals [to water] are in the first group