Across
- 1. of conservation of mass the mass of the products in a chemical reaction must equal the mass of the reactants
- 5. a group of atoms bonded together
- 6. gas helium
- 10. changes during a reaction
- 13. energy is released
- 14. what you get after you mix things together
- 16. no electric charge
- 17. negatively charged
- 20. Mendeleev developed the periodic table
- 22. sodium, alike metals has one electron
- 23. consists of protons and electrons
- 25. how the elements are arranged with increasing atomic numbers
Down
- 2. mass their absorbency
- 3. energy is absorbed
- 4. the material of chemical gas or metal that is on the periodic table
- 7. to place farmers do what to crops every year
- 8. the smalles unit of an element
- 9. positively charged element
- 11. can form alloys with metals
- 12. 18 numbers groups on the periodic table
- 15. two electrons and is associated with a region of a chemical bond
- 18. composed of two or more separate elements
- 19. metal very brittle and cannot be made into wire
- 21. electrons participate in thr formation of a chemical bond
- 24. the letters of an element (au)