The Periodic Table

4. Mendeleev ordered the his Periodic Table by increasing atomic _____________ .
7. The Modern Periodic Table is ordered by increasing atomic __________ .
8. How does the reactivity change as you move down the alkali metals.
10. Most metals are this state of matter at room temperature.
11. A column of the Periodic Table.
12. The lowest mass halogen.
14. The only metal that is a liquid at room temperature.
16. Metals bend and can be shaped without breaking. They are _________.
18. This element is in Period 3 and Group 13.
19. Non-Metals break under stress. They are _________.
20. A row of the Periodic Table.
21. The lowest mass alkali metal.

1. Moseley discovered this particle, which led to changes in the Periodic Table.
2. The lowest mass Noble Gas.
3. Metals have high thermal and electrical __________.
5. Mendeleev left these when he believed an element had not yet been discovered.
6. This element has a higher atomic number but a lower atomic mass than the element before it. This caused an issue for Mendeleev when ordering the elements.
9. Mendeleev grouped elements with similar __________.
13. The property of an element that relates to whether it is shiny or dull.
15. This repeats every time a new period is started.
17. The name of the group containing unreactive elements.
18. The lowest mass alkaline earth metal.