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Isotopes Same but different Students will be able to identify # of subatomic particles in isotopes. 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 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 Isotopes Atoms with the same # of protons but different # of neutrons Atomic # = # protons (identity) Atomic mass = protons & neutrons in the nucleus electron neutron proton Isotopic Notation Mass # = protons + neutrons 33 How many: Protons? (atomic #) S 16 Atomic #: if not given-look it up! Neutrons?(mass # - atomic #) Electrons? (neutral atoms) protons = electrons Who am I? An atom that contains 14 protons? An atom with 10 protons? An atom with an atomic number of 98? Isotopes of Silver Silver – 107 Silver – 109 Mass Number # protons? # neutrons? # electrons? # protons? # neutrons? # electrons? Isotopes of Silver Silver – 107 Silver – 109 # protons? 47 # neutrons? 60 # electrons? 47 # protons? 47 # neutrons? 62 # electrons? 47 Isotopes: Same # of protons, different # neutrons (mass numbers differ) 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: [email protected] PW: molecule HW stamp sheet and notes due Thursday!