Periodic Table

1. means "Happening at regular interval"
3. group 3-12 are these types of metals
4. on the periodic table that reminds you where the metals, nonmetals, and metalloids are
9. A Russian who discovered a pattern to the elements in 1869
11. Mendeleev arranged the "blank" in order of increasing the atomic mass
14. metals are less active than alkali metals are
16. the atomic number in an atom
18. unreactive nonmetals and are in group 18 of the periodic table

1. states that the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers
2. metals that are elements in group 1 of the periodic table
5. table known for the elements
6. a British scientist
7. a row of elements is called this
8. very reactive nonmetals
10. Mendeleev arrange his cards by different "blank" such as density, appearance, and melting point
12. the "blank" indicates the type of element
13. a yellowish green gas
15. Mendeleev thought that more accurate of these would fix the flaws in his table
17. all the elements fit the "blank" in Mendeleev's periodic table when they were arranged by atomic number
19. group contains one metalloid and five metals