Across
- 3. a substance made of two or more elements bonded together
- 6. a type of electron that's in the outer shell of an atom
- 8. the columns on the periodic table
- 9. a positive ion
- 10. small numbers to the bottom right of an element to show how many atoms are in a compound
- 13. a measure of how strong an element can pull on another element's valence electrons
Down
- 1. the rule that atoms want 8 valence electrons
- 2. a type of compound that involves two ions
- 4. the rows on the periodic table
- 5. to the right on the periodic table, tend to form negative charges
- 7. a negative ion
- 11. a charged atom
- 12. to the left on the periodic table, tend to form positive charges