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Across 1. Solid that forms and settles out of a liquid mixture 5. Matter that has a uniform and definite composition 7. Tiny central core of an atom 8. Set of eight electrons 10. No definite shape or volume 13. Positively charged ion 15. Negatively charged subatomic particles 16. The strongest covalent bond 18. Atoms held together by sharing electrons 19. Anything that has mass and occupies space

Down 2. The study of chemicals and the changes they undergo 3. Ability of an atom to attract electrons 4. Valence Shell electron-pair repulsion theory 6. Smallest repeating unit of the crystal lattice 9. Atoms with the same number of protons but different neutrons 11. Mass divided by volume 12. Neutral group of atoms joined together by covalent bonds 14. Principle where electrons occupy the lowest energy levels first 17. Measure of the space occupied by the object 20. Smallest particle of an element