Matter Review

5. atomic mass/ the average mass of an element's isotopes, weighted according to the abundance of each isotope
6. change/ a change in size, shape, form, or state of matter in which the identity stays the same
8. a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties
11. a type of mixture that is evenly mixed
12. credited with discovering neutrons and that they are neutral
13. the number of protons in an atom
16. a substance that consists of two ore more different elements chemically bonded together
17. an atomic particle with a negative charge
18. describes elements that spontaneously emit radiation
19. states that electrons orbit the nucleus
20. to form a solution by mixing evenly
21. a characteristic of matter that you can observe or measure without changing the identity of the matter
26. the mass per unit volume of a substance
27. discovered electrons

1. Said, "Atoms are small solid objects that cannot be divided, created, or destroyed"
2. matter with a composition that is always the same
3. a neutral particle found in the nucleus of an atom
4. the ability of one substance to dissolve in another
7. the smallest piece of an element that still represents the element
8. a characteristic of matter that can be observed as it changes to a different type of matter
9. the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
10. states that electrons can be found in the electron cloud
14. any of two or more atoms of the same element that have different numbers of neutrons
15. an atom that is no longer neutral because it has gained or lost electrons
22. mixture/ a type of mixture that is unevenly mixed
23. the sum of protons and neutrons
24. discovered the nucleus
25. anything that has mass and takes up space
28. an atomic particle with a positive charge