1. ATOMIC THEORY REVIEW

2. ATOMS !!! What are the 3 subatomic particles? Protons, neutrons, & electrons!!! WHAT IS ALL MATTER MADE OF?

3. What are the charges of the subatomic particles? p (+) positive n (0) neutral e (-) negative We know that there are the same number of p + and e - in atoms on the Periodic Table… So What is the overall charge of any atom? The overall charge of any atom is NEUTRAL… the positive charge cancels out the negative charge = 0!!!

4. What are the masses (amu) of the subatomic particles? p + = 1 n = 1 e - = 0 1.66 x 10 -27 kg = 1 amu What is this AMU stuff????? Atomic mass unit (AMU) 2.2 lbs= 1 kg

5. What are the two areas of an atom? Nucleus and electron cloud

6. Where are the p+, n, and e- located in an atom? p+ in the nucleus n in the in nucleus e- in the electron cloud

7. NUCLEUS Where is ALL the mass in an atom located? Where is most of the volume of an atom located? Electron Cloud

8. The nucleus contains the p+ and n… while the electrons “orbit” the nucleus in the energy rings of the e- cloud. What does a Bohr model of the atom look like?

9. So what are the charges of the different areas? 1. So what is the charge of the nucleus? Positive 2. So what is the charge of the electron cloud? Negative

10. QUICK REVIEW- ATOMS Sub-atomic particles:. particleschargeamulocationabbrev. Protons Electrons e- Neutral (0) +p+nucleus 0 1 1 neutrons Electron cloud _ nucleusnono protons, neutrons, and electrons nucleus and electron cloudParts of the atom:

11. Energy Levels of the Atom 8 e- 2e- 32e- 8 e- 18 e- 18 e- 32e- The Nucleus P+ N 0 1 st shell 7 th shell 2 nd shell 3 rd shell 4 th shell 5 th shell 6 th shell Atoms can have several energy levels. Sometimes they are also called energy rings, shells or orbits.