1. Chemistry 3 Page 13 notebook

2. Warm up – true/false for an atom 1. Numbers of protons can change 2. Numbers of neutrons can change 3. Numbers of electrons can change TRUE FALSE

3. Isotopes  If an atom has different numbers of neutrons they are called ISOTOPES FYI – isotopes are often unstable and decay over time at known intervals (dating method)

4. FYI  It is because of isotopes that atomic masses are not whole numbers

5. Ions  Atoms with an unbalanced charge  Proton number ≠ Electron number  More protons = positive ion (cation +)  More electrons = negative ion (anion -)

6. What is the difference between the atomic mass and atomic number?

7. Atom Lab Objective: understand how chemical formulas are written.  Qualitative Observations  Do not write on or damage laminated pages  When finished work on Periodic Table due 14th Play video next slide while passing out directions and photo packets

8. Periodic Table of Elements https://www.youtube.com/watch?v=1cqauZq4uYM

9. Hydrogen, Helium, Heavier  https://www.youtube.com/watch?v=CgWHbp MVQ1U https://www.youtube.com/watch?v=CgWHbp MVQ1U  https://www.youtube.com/watch?v=oNMGZ QVkNQY https://www.youtube.com/watch?v=oNMGZ QVkNQY