Across
- 3. Rutherford discovered these in his Gold Foil Experiment
- 4. A pure substance that can't be broken down
- 5. A row of the periodic table
- 6. Exploding stars that form the heaviest of elements
- 7. How new elements are formed in stars
- 8. The number of protons in an atom
- 10. The symbols for Chlorine, Oxygen, Carbon, and Potassium
- 11. The combined weight of protons and neutrons
Down
- 1. The smallest particle of an element
- 2. An atomic that has the same atomic number but a different atomic mass
- 5. Mendeleev did this about unknown elements
- 7. A group, or column, of the periodic table
- 9. Protons and neutrons are located here