Across
- 3. first element to be made artificially
- 6. scientists used this to weigh the elements
- 7. the highest unexcited energy level for an electron
- 8. the number of elements found in nature
- 9. who first introduced the periodic table
Down
- 1. decreases from top to bottom and left to right
- 2. what the rows on the periodic table are called
- 4. each one of these is a unique type
- 5. opposites of the table do this
- 10. type of most elements on the periodic table