Matter Vocabulary

3. anything that takes up space and has mass.
4. states that matter is not created or destroyed only changes forms.
8. elements that are ususally gases or brittle solids and poor conductors of electricity and heat.
12. positively charged particle located inthe nucleus of an atom and that is counted to identify the atomic number.
13. matter with a fixed composition whose identity can be changed by chemical processes but not ordinary means.
14. a substance produced when elements combine and whose properties are different from each of the elements in it.
16. average mass of an atom of an element
18. natural or synthetic material that cannot be broken down into simpler materials; has unique properties.

1. two or more atoms of the same elements that have different numbers of neutrons in their nuclei.
2. combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture's identity.
5. number of protons in the nucleus of each atom of a given element; it is the topnumber in the periodic table
6. positively charged, central part of an atom.
7. a small particle tha tmakes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons.
9. an uncharged particle located in the nucleus of an atom.
10. invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus.
11. element that has characteristics of both metals and nonmetals and is a solid at room temperature.
15. sum of the number of protons and neutrons in the nucleus of an atom.
17. element that is malleable, ductile, and a good conductor of electricity, and generally has metallic luster.