Across
- 1. a change without changing composition
- 5. element represented by K
- 7. element with one proton, and one energy level
- 11. a subatomic particle with a negative charge
- 12. a row on the periodic table
- 13. the unit used to measure atoms
- 16. arrangements of atoms.
- 18. the rings around an atom with electrons
- 19. element represented by Si
- 20. the smallest building block of the world
Down
- 2. the letters representing an element
- 3. a subatomic particle with a positive charge
- 4. electrons on the outer energy level
- 6. shows how many protons there are
- 8. a table with all elements arranged on it
- 9. change in a substance atoms arrangement
- 10. a subatomic particle with a neutral charge.
- 14. a column on the periodic table
- 15. element with 6 protons, and 2 energy levels
- 17. things organized on the periodic table