Across
- 3. The basic unit of an element
- 5. Electrons in the outer shell of an atom
- 11. The way atoms are arranged in a compound
- 12. An atom with a positive or negative charge
- 13. A negatively charged ion
- 16. Two or more atoms held together by bonds
- 18. A particle in the nucleus with no charge
- 19. A force that holds atoms together
Down
- 1. A positively charged particle in the nucleus
- 2. When atoms have full outer shells
- 4. A positively charged ion
- 6. A substance made of two or more elements
- 7. Shows the elements in a compound
- 8. Atoms want 8 electrons in their outer shell
- 9. Something that takes part in a chemical reaction
- 10. Needed to form or break chemical bonds
- 12. A bond formed when electrons are transferred
- 14. A tiny, negatively charged particle in an atom
- 15. A bond formed when electrons are shared
- 17. A pure substance made of one kind of atom