Across
- 6. are the electrons filling the outermost shell of an atom
- 8. group of atoms held together by chemical forces
- 10. is the object that revolves around the Earth
- 11. Negative subatomic particle of the atom
- 12. the biggest planet in our solar system
- 14. the smallest unit of an element
Down
- 1. the study of planets
- 2. The belt that surrounds our solar system
- 3. the ball of gas that gives Earth life
- 4. the 1st planet from the sun the hottestAstroid beltour solar system
- 5. The neutral charge of the atom
- 7. the 4th and 5th planet
- 9. the 3rd planet from the sun
- 13. the now dwarf planet that used to be a planet
- 15. a planet that has a chance of carrying life