Across
- 2. discovered electrons
- 3. a substance that consists of two ore more different elements chemically bonded together
- 5. a characteristic of matter that you can observe or measure without changing the identity of the matter
- 7. mixture/ a type of mixture that is unevenly mixed
- 10. describes elements that spontaneously emit radiation
- 11. credited with discovering neutrons and that they are neutral
- 14. states that electrons can be found in the electron cloud
- 15. an atom that is no longer neutral because it has gained or lost electrons
- 16. the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
- 18. the ability of one substance to dissolve in another
- 20. atomic mass/ the average mass of an element's isotopes, weighted according to the abundance of each isotope
- 23. the smallest piece of an element that still represents the element
- 24. a type of mixture that is evenly mixed
- 25. the number of protons in an atom
- 27. Said, "Atoms are small solid objects that cannot be divided, created, or destroyed"
- 28. anything that has mass and takes up space
Down
- 1. the sum of protons and neutrons
- 4. to form a solution by mixing evenly
- 6. a characteristic of matter that can be observed as it changes to a different type of matter
- 8. matter with a composition that is always the same
- 9. an atomic particle with a positive charge
- 12. a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties
- 13. any of two or more atoms of the same element that have different numbers of neutrons
- 17. discovered the nucleus
- 19. the mass per unit volume of a substance
- 21. states that electrons orbit the nucleus
- 22. a neutral particle found in the nucleus of an atom
- 26. an atomic particle with a negative charge