Across
- 1. the sum of protons and nuetrons in the atom
- 4. a particle with positive charge
- 5. smallest particle of an element
- 7. a negative cloud around the nucleus
- 9. elements on the left side of the table
- 10. make up groups 3-12
- 13. a table of elements arranged by their propeties
- 16. row 17 on the periodic table
- 18. in between metals and non metals
Down
- 2. the average mass of naturally occuring isotopes that make up an element
- 3. a particle with no charge
- 6. the elements on the right side of the periodic table
- 8. the same elements that have a different number of nuetrons
- 11. the last row on the periodic table
- 12. the center of the atom
- 14. number of protons in the nucleus
- 15. the horizontal rows of the periodic table
- 17. the verticle rows or columns on the periodic table