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Across 2. the allotrope of oxygen that consists of 3 atoms 4. compounds that do not contain C 10. because ionic compounds are ____ the positive charge equals the negative charge 12. the types of metals that require a Roman numeral 13. a compound in which all the water has been removed 15. polyatomic ions need to be written within these in a formula 17. coal, natural gas, petroleum 21. compounds that contain only hydrogen and carbon 22. ionic compounds have a ____ MP 23. ion that has two or more different elements 24. the common name for NH3 25. compound contains only 2 elements 26. a drying agent 27. distillation will not work to separate liquids if they all have the same ______ 28. an allotrope of C that exists in flat layers that slide over each other 29. positive ion 30. substances that absorb enough water from the atmosphere to form a liquid solution

Down 1. covalent compounds are less _________ in water than ionic compounds 3. negative ion 5. compounds that contain C 6. molecules of a single element that differs in crystalline or molecular structure 7. simplest hydrocarbon 8. an allotrope of C that exists as a crystal and in a 3-D structure 9. the tiny number added after a symbol to show the number of atoms 11. molecules that form when atoms of the same element bond together 12. diatomic elements exist as ____ elements 14. separating a substance into its components by using their boiling points 16. ionic compounds conduct ____ when dissolved or melted 18. simplest ratio of ions 19. covalent compounds have low ________ 20. a compound in which there is a specific ratio of water to ionic compound 21. compounds that easily absorb water from air