Across
- 2. point at which solid turns to liquid
- 3. place where protons and neutrons are together
- 6. group of different type of atoms
- 9. negatively charged particle in an atom
- 10. first element in the periodic table
Down
- 1. chemical formula(name) of common salt
- 4. vertical column in the periodic table
- 5. supporter for combustion
- 7. total of protons and neutrons in an atom
- 8. solid form of water