Across
- 3. a group of atoms covalently bonded together
- 5. the bond between two nonmetal atoms
- 6. the type of reaction where two substances are combined to make a new substance
- 11. the building blocks of matter
- 12. a reaction that absorbs heat
- 15. the bond between two metal atoms
- 16. the type of reaction where a compound breaks down into simpler substances
Down
- 1. burning; a reaction with O2
- 2. the most reactive group of metals
- 4. a charged atom
- 7. the most reactive group of nonmetals
- 8. elements with properties in between metals and nonmetals
- 9. the least reactive group of elements
- 10. the bond between a metal atom and a nonmetal atom
- 13. a reaction that releases heat
- 14. a substance added to a chemical reaction to increase the reaction rate