1. ATOMIC STRUCTURE Notes are for your personal use. Abbreviate as you see fit.

2. Atomic Structure Atoms are the ____________ of matter, or building blocks to make all solids, liquids & gases Atoms can be broken down into ____________ of SUBATOMIC PARTICLES

3. SUBATOMIC PARTICLES 1. ______________ = positive electrical charge, found in the NUCLEUS, or center of an atom 2. _______________= neutral (no electrical charge), also found in the NUCLEUS

4. SUBATOMIC PARTICLES 3. ______________= negative electrical charge, found moving around the nucleus in the ELECTRON CLOUD

5. Atomic Structure

6. Electrons like to travel _______, when they can find another electron to travel with. Different layers within the electron cloud are called ________________ or SHELLS

7. Atomic Structure ENERGY LEVELS or ________ hold different amounts of electrons There are exceptions to the rule, but the basic idea is:

8. Atomic Structure Level 1 holds _______ electrons Level 2 holds _______ electrons

9. Atomic Structure Level 3 holds _______ electrons Level 4 holds _______ electrons

10. Draw an atom with 4 energy levels

11. How to find atomic structure Check the PERIODIC TABLE OF ELEMENTS Created by _____________ in 1869 Page 134-135 in your text

12. How to find atomic structure ATOMIC NUMBER = __________________ in the nucleus Each different atomic number is a new _______________, or pure substance that cannot be broken down

13. How to find atomic structure ATOMIC MASS = __________ PLUS ________ in the nucleus Neutrons ____________ to an atom, making some elements “heavy” or “light”

14. How to find atomic structure Atomic Mass- ___________ = # of ____________ Neutrons usually __________ as the atomic number increases. This means as atoms hold more protons, they usually hold more neutrons too!

15. How to find atomic structure To find the number of electrons in an atom, check the atomic number. For every _________, an atom will have a __________

16. THE END