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