Across
- 2. particles of light
- 3. a negatively charged ion
- 5. unit of energy
- 10. a positively charged ion
- 12. elements found between metals and nonmetals
- 15. bonds formed when atoms share electrons
- 18. a mixture in which substances are evenly distributed throughout the mixture
- 20. a horizontal row of elements on the periodic table
- 21. 0 kelvin
- 23. elements found to the left side of the periodic table
Down
- 1. a reaction that absorbs energy in the form of heat
- 3. group 1 elements
- 4. group 17 elements
- 6. smallest particle of an element
- 7. Avogadro's number of anything
- 8. anything that has mass and takes up space
- 9. groups of two or more atoms held together by chemical bonds
- 11. elements found at the far right side of the periodic table
- 13. a chemical reaction that gives off heat
- 14. groups 3-12 on the periodic table
- 15. the study of the properties of matter and how matter changes
- 16. bonds resulting from the attraction between oppositely charged ions
- 17. atoms of the same element with different numbers of neutrons
- 19. a region in an atom where there is a high probability of finding electrons
- 22. a number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound