Across
- 2. group 18 in periodic table, they are the most stable and nonreactive elements.
- 3. horizontal row of elements in the periodic table
- 9. chemical reaction that releases energy
- 10. positively charged particle in the nucleus of an atom
- 11. chemical reaction that absorbs energy
- 15. the degree to which a specified material conducts electricity
- 17. a pure substance formed when two non metals combine
- 19. ability to pound and roll into flat sheets
- 23. metal the first column of the periodic table excluding hydrogen,that a really reactive in air and water
- 24. substance that helps a chemical reaction proceed more quickly
- 25. workplace hazardous information material system
Down
- 1. at table in which elements are organized by their physical and chemical properties
- 4. number of protons in the nucleus of one atom of an element
- 5. a pure substance formed when at least on metal and one non metal combine
- 6. catalyst involved in chemical reactions in living things
- 7. neutral particle in the nucleus of an atom
- 8. Mass of Reactants= Mass of Products
- 12. Irreversible change
- 13. invisible negatively charged particle that orbits the nucleus of and atom
- 14. chemical change that occurs when oxygen in the air reacts with a metal
- 16. element that has both metallic and non metallic properties
- 18. the mass of an element measured in amu
- 20. shininess of a metal
- 21. what everything is made up of
- 22. can be stretched into wire