Science 10: Periodic TableThe periodic table lists each element according to its atomic number, from left to right across each row. Atomic number is also equal to?

Each row is called a periodEach column is called a group or family

The elements in the same group or family have very similar chemical properties

Groups to be familiar with: Alkali metals (Group 1; excluding hydrogen) – very reactive metals Alkaline earth metals (Group 2) – somewhat reactive Halogens (Group 17) – very reactive non-metals Noble gases (Group 18) – very unreactive gaseous non-metals (inert) Transition metals (Groups 3 – 12)

The black staircase line represents the separation of the metals from the non-metals