Across
- 2. occurs between two nonmetals, shares electrons
- 5. when an atom has 8 valence electrons so it's stable
- 7. a chemical reaction that releases energy and heat
- 8. also known as chemical change
Down
- 1. occurs between a nonmetal and a metal, gives away electrons
- 3. a chemical reaction that requires energy to occur
- 4. The kind of electron on the outermost shell of an atom
- 6. When two or more atoms bond together
- 9. the building blocks of everything in the universe