Across
- 7. the number of protons and electrons in an atom
- 10. made up of tiny particles allowing it to flow and create the shape of the container
- 12. atoms with the same number of protons but different number of neutrons
- 13. the simplest form of matter made up by one atom
- 14. a thing that is composed of two or more separate elements
- 16. an atom that gains electrons
- 18. one type of atom that cannot be picked apart physically
- 19. central region of an atom made up of protons and neutrons
Down
- 1. a table of chemical elements arranged by atomic number
- 2. a negatively charged particle
- 3. the smallest and basic unit of a chemical element
- 4. has a definite shape and mass and volume and doesn’t move to fit its container
- 5. a particle that is neutral and has no charge
- 6. a group of atoms bonded together creating a small chemical compound so it can take part in a chemical reaction
- 8. anything that takes up space and has volume and mass
- 9. a positively charged particle
- 11. atoms that gain or lose electrons
- 13. the system of electrons surrounding the nucleus
- 15. has no fixed shape and no fixed volume
- 17. an atom that loses electrons