Periodic Table

1. noble gas which is used to create "neon signs"
3. the ____ family contains oxygen and sulfur, which are essential for life.
5. tin and ____ are metals used in many products.
7. periodic _____ are the tendencies of certain elemental characteristics to increase or decrease as one progresses along a row or column of the periodic table
10. elements in the same groups have similar _______
11. electrons electrons located on the outermost energy level of an atom
12. _____ metals- metals occupying center block (groups 4-12) show variable valence and strong tendency to form coordination compounds
13. an element whose properties are intermediate between those metals and solid nonmetals
14. solid material, hard, shiny, and has good electrical and thermal conductivity
16. the state or power of being reactive or degree to which a thing is reactive
18. is a column of elements in the periodic table
19. another name for a group is a ______
21. ____ table- table consisting of groups and periods of elements

2. gasses any gas in group 18, long believed to be nonreactive
4. element or substance that is not a metal
6. the number of protons in the nucleus of an atom which determines the chemical properties of an element
8. a series of rows on the periodic table
9. radioactive period of elements; several are synthetic and don't occur naturally
15. element with one valence electron and one proton
17. ____ metals- elements occupying group 1A, very reactive, form strong alkaline metals
20. element with an atomic mass of 65.38