The Periodic Table

3. family, vertical column of elements on the periodic table
5. unreactive nonmetals and are in Group 18
6. very reactive, in Group 17
7. is in the boron group, the most abundant metal in Earth's crust
10. less reactive than alkali metals are
14. a Russian chemist, discovered a pattern to the elements in 1869
15. formed from burning oil, coal, and wood
16. also called semimetals, are the elements that border the zigzag line on the periodic table
17. found to the right of the zigzag line on the periodic table

1. gas at room temperature, makes up about 80% of the air you breathe
2. elements of Group 3 - 12
4. horizontal row of elements on the periodic table
8. forms a wide variety of compounds
9. states that the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers
10. elements in Group 1 of the periodic table
11. most abundant element in the universe
12. "happening at regular intervals'
13. found to the left of the zigzag lin on the periodic table
14. British scientist, determined the number of protons the atomic number in an atom
18. makes up about 20% of air, necessary for substances to burn