Across
- 2. They make up everything
- 3. used in thermometers
- 5. negatively charged
- 7. neutrally charged
- 9. represents how many protons make up an element
- 11. makes balloons float, second element on the periodic table
Down
- 1. atoms of the same element that have different amounts of neutrons
- 3. the total sum of all protons and neutrons in an atom
- 4. the first element on the periodic table
- 6. positively charged
- 8. combined to an inseparable point
- 10. where the protons and neutrons found