Across
- 4. What are the only elements that are liquid at room temperature?
- 5. How many atoms are there in H2O?
- 7. Who positively charged a sphere with negatively charged electrons circling around it?
- 11. oxide What makes Marses surface red?
- 12. What expands as it freezes?
- 13. Suggested that electrons move in a more of a circular pattern?
- 15. hydride Nitrogen2 hydrogen as a full word?
- 16. Who said atoms were mainly empty spaces where positive particles could pass?
Down
- 1. What colour is liquid oxygen?
- 2. Who stated that a substance could be pure?
- 3. Who discovered electrons?
- 6. dioxide What is CO2?
- 8. Who was believed because of his popularity?
- 9. Who created a system for naming chemicals?
- 10. Who named the invisible particle "Atomos"?
- 14. Who discovered that a nucleus contains positive charges called protons and negative charges called neutrons?