Across
- 3. developed the quantum theory
- 5. makes up proton and neutron
- 8. the elements in group 17
- 12. Gas changes directly into a solid
- 14. The horizontal rows in periodic table
- 15. A device that automatically regulates temperature
- 17. same number of proton different number of neutron
- 18. gas changes into liquid
- 20. first one to prepare hydrogen in liquid form
- 21. when atoms loses an electron
- 22. liquid metal
- 23. Invented miner's lamp
- 24. the substance that dissolves
Down
- 1. the SI unit for energy
- 2. also known as oxygen family
- 4. explosive mixture of methane and other gases
- 6. A solid changes directly into gas
- 7. molecules with same number and type of atoms but different arrangement
- 9. solid in which molecules are not arranged in orderly patterns
- 10. considered as the founder of science of thermodynamics
- 11. responsible for air pressure
- 13. this is the transfer of thermal energy
- 16. mixture containing tiny suspended particles
- 19. A substance composed of single type of atom