Matter Review

2. change/ a change in size, shape, form, or state of matter in which the identity stays the same
3. any of two or more atoms of the same element that have different numbers of neutrons
6. an atomic particle with a negative charge
7. the number of protons in an atom
9. discovered the nucleus
10. a type of mixture that is evenly mixed
11. atomic mass/ the average mass of an element's isotopes, weighted according to the abundance of each isotope
13. states that electrons can be found in the electron cloud
16. the ability of one substance to dissolve in another
17. a substance that consists of two ore more different elements chemically bonded together
18. the mass per unit volume of a substance
20. a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties
21. anything that has mass and takes up space
23. the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
25. an atomic particle with a positive charge
26. matter with a composition that is always the same

1. discovered electrons
2. a characteristic of matter that you can observe or measure without changing the identity of the matter
4. mixture/ a type of mixture that is unevenly mixed
5. states that electrons orbit the nucleus
8. describes elements that spontaneously emit radiation
12. the smallest piece of an element that still represents the element
14. a characteristic of matter that can be observed as it changes to a different type of matter
15. to form a solution by mixing evenly
19. Said, "Atoms are small solid objects that cannot be divided, created, or destroyed"
20. credited with discovering neutrons and that they are neutral
22. an atom that is no longer neutral because it has gained or lost electrons
23. a neutral particle found in the nucleus of an atom
24. the sum of protons and neutrons