1. Is it Christmas yet? Where are my presents?
Chapter 12
Is it Christmas yet? Where are my presents?

2. Periodic
Something that repeats in a regular pattern

3. period
Horizontal rows on the periodic table

4. group
A vertical column of elements – they share properties or traits like a family

5. Periodic law
The chemical and physical properties of the elements change with their atomic number.

6. Alkali metals
Group I on the chart
Very active metals

7. Alkali earth metal Elements that are in group 2.
Silvery but not as reactive as the group 1 metals

8. halogen
Combine with metals to make salt
Group 17 or 7

9. Noble gas Nonmetals that don’t want to react with other elements
They don’t play well with others – they want to be left alone.

10. Transition Metals Less reactive of all the other metals
Usually silver in color
Properties vary widely

11. hydrogen Has properties unlike any other group
Act more like nonmetals than metals

12. metalloids
Semiconductors
Anything touching the stairs

13. lanthanides Gives us the color red on computer screens
Used to make steel – very shiny