Across
- 3. found in nature combined with other elements
- 5. shares many properties with metals and nonmetals
- 7. to reactive to be found in nature and can easily be cut with a knife
- 8. designed a periodic table
- 9. indicates energy levels
Down
- 1. can form many different compounds
- 2. element that has 3 protons and is third on the periodic table
- 4. metals shiny metals that are harder than alkaline metals
- 6. indicates valance electrons