Matter Review

4. matter with a composition that is always the same
6. the ability of one substance to dissolve in another
7. the number of protons in an atom
8. an atomic particle with a negative charge
9. the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
11. a characteristic of matter that can be observed as it changes to a different type of matter
12. a characteristic of matter that you can observe or measure without changing the identity of the matter
15. a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties
18. to form a solution by mixing evenly
19. anything that has mass and takes up space
21. Said, "Atoms are small solid objects that cannot be divided, created, or destroyed"
23. discovered electrons
26. states that electrons orbit the nucleus
27. discovered the nucleus
28. the sum of protons and neutrons
29. the mass per unit volume of a substance

1. a type of mixture that is evenly mixed
2. atomic mass/ the average mass of an element's isotopes, weighted according to the abundance of each isotope
3. change/ a change in size, shape, form, or state of matter in which the identity stays the same
5. states that electrons can be found in the electron cloud
10. the smallest piece of an element that still represents the element
13. describes elements that spontaneously emit radiation
14. an atom that is no longer neutral because it has gained or lost electrons
16. mixture/ a type of mixture that is unevenly mixed
17. credited with discovering neutrons and that they are neutral
20. any of two or more atoms of the same element that have different numbers of neutrons
22. an atomic particle with a positive charge
24. a substance that consists of two ore more different elements chemically bonded together
25. a neutral particle found in the nucleus of an atom