Across
- 4. found in organic compounds
- 6. molecules of long chains of monomers
- 8. a chemical bond resulting from the attraction between oppositely charged ions (metals and nonmetals)
- 12. elements elements such as hydrogen, nitrogen, oxygen, fluorine, bromine, and iodine that cannot exist by themselves
- 13. atoms lose, gain, or share electrons in order to acquire a full set of eight valence electrons
- 14. matter that makes up the stars
- 15. a solid that is made up of crystals in which particles are arranged in regular, repeating patterns
- 16. the temperature at which a liquid freezes
- 18. used to name covalent compounds
- 20. a fat that is solid at room temperature; animal fats
- 21. the temperature at which a solid melts
Down
- 1. form covalent bonds between them
- 2. a group of covalently bonded atoms that have a charge
- 3. the amount of matter in an object
- 5. poor conductors of heat and electricity; found on the right side of the periodic table
- 7. one
- 9. electrons in the outermost energy levels
- 10. four
- 11. elements that have properties of metals and nonmetals; found along the stair-step line on the periodic table
- 17. found to the left side of the periodic table
- 19. numbers written below the line that tell how many atoms of a given element are in a compound