Across
- 3. A pure substance that cannot be separated into simpler substances
- 8. 1 on the periodic table
- 9. The rarest element
- 10. Fe
- 11. One or two letter code used to identify the elements
- 13. The name given to the horizontal rows on the periodic table
Down
- 1. The basic building blocks of neutrons and electrons
- 2. Au
- 4. First artificial element made by man
- 5. Helium, Radon,and Argon
- 6. decreases as you go from left to right across a period
- 7. Most of the elements in the periodic table are
- 12. The vertical columns on the periodic table are called
- 14. the gas we breathe