1. Isotopes Same but different Students will be able to identify # of subatomic particles in isotopes.

2. Same but different?  Pre-1982 penny = 3.11 g  Post-1982 penny = 2.55 g  Same coin…why?  Inside different: Pre-1982 all Cu Post-1982 Zn & Cu

3. Pennies vs Isotopes  Both kinds have same identity  Both have different masses because the insides are unique  Unlike pennies atoms are too small to see

4. Isotopes  Atoms with the same # of protons but different # of neutrons  Atomic # = # protons (identity)  Atomic mass = protons & neutrons in the nucleus

5. Isotopic Notation 33 33 S 16 16 Mass # = protons + neutrons Atomic #: if not given-look it up! How many: Protons? (atomic #) Neutrons?(mass # - atomic #) Electrons? (neutral atoms) protons = electrons

6. Who am I?  An atom that contains 14 protons?  An atom with 10 protons?  An atom with an atomic number of 98?

7. Isotopes of Silver  Silver – 107  # protons?  # neutrons?  # electrons?  Silver – 109  # protons?  # neutrons?  # electrons? Mass Number

8. Isotopes of Silver  Silver – 107  # protons? 47  # neutrons? 60  # electrons? 47  Silver – 109  # protons? 47  # neutrons? 62  # electrons? 47 Isotopes: Same # of protons, different # neutrons (mass numbers differ)

9. To do list:  HW #7: p. 872-3 (chapter 4) #1-6; p. 113 #72  HW #8 & Power word examples (both columns) will be turned in on Wednesday. Arrange to check answers before test day!  All homework makeups due by Wednesday.  Makeup instructions and files on dropbox.com  Login: CYPchem@yahoo.com CYPchem@yahoo.com  PW: molecule  HW stamp sheet and notes due Thursday!