Across
- 4. vertical columns in the periodic table called
- 5. Fe is the symbol for what element
- 6. this step involves using the 5 senses
- 9. electrons in the outermost shell
- 10. most abundant elements of the periodic table
- 12. the difference between atomic mass and atomic number
- 13. equals the number of protons
- 14. horizontal columns in the periodic table
- 15. minimum times an experiment should be conducted
- 16. number of electrons in the second and third shell
- 17. variable that is measured
- 18. these elements have the nickname of the staircase
- 19. most exciting step of the scientific method
- 20. final step of the scientific method
Down
- 1. equals the number of protons
- 2. written as an if then statement
- 3. found in the nucleus
- 7. number of electrons in the first shell/cloud/energy level
- 8. pure substance made up of only one atom
- 11. what is changed in an experiment/testing