1. Atoms, Molecules, and the Elements A Science Unit for Mrs. Berg’s Class

2. atom 1. The basic building block of matter. 2. The smallest component of an element having the chemical properties of the element.

3. chemical formula noun A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound. ex. Al2(SO4)3

4. compound noun,verb,adjective A substance made up of two or more elements chemically joined together into a molecule. NaCl = salt

5. electron noun particle in an atom that has a negative electrical charge

6. element noun A substance whose atoms are all alike. There are over 100 elements on the Periodic Table.

7. gas noun,verb One of the three states of matter. This state of matter has no fixed shape and no fixed volume.

8. heterogeneous adjective These types of mixtures contain more than one substance evenly mixed but not chemically bonded together and is the same throughout.

9. homogeneous adjective When two or more substacnes come together but don't chemically combine or bond to make a new substance it is called this.

10. inorganic adjective Any substance that does not contain carbon.

11. ion noun a positively or negatively charged atom

12. liquid noun,adjective A state of matter that has no fixed shape but that has a definite volume.

13. matter noun,verb Anything that takes up space and has mass.

14. molecule noun The smallest physical unit of a substance that can exist independently, consisting of one or more atoms held together by chemical forces.

15. neutron noun An elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus.

16. nucleus 1. The positively charged center of an atom. 2. The nucleus is in the center of the atom

17. organic noun,adjective Obtained from a living thing; Containing carbon

18. particles noun Very small pieces of matter.

19. proton noun A stable particle with positive charge equal to the negative charge of an electron.

20. solid noun,adjective A state of matter that has a definite shape and a definite volume.

21. solution noun A homogeneous mixture that has dissolved substances.