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Chapter 3

Chapter 3. Atoms. Ions. Ions. If an ion has a charge of -2, what has happened to the atom?. The atom has gained two electrons. If an ion has a charge of +2, what has happened to the atom?. The atom has lost two electrons. Isotopes. Isotopes. Count the neutrons and protons. Proton.

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Chapter 3

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  1. Chapter 3

  2. Atoms

  3. Ions

  4. Ions If an ion has a charge of -2, what has happened to the atom? The atom has gained two electrons If an ion has a charge of +2, what has happened to the atom? The atom has lost two electrons

  5. Isotopes

  6. Isotopes Count the neutrons and protons Proton Neutron http://www.green-planet-solar-energy.com/images/helium-isotopes-5-to-8.gif

  7. Timeline Curie Thomson Bohr Boyle Beginning Present Millikan Greeks Dalton Rutherford

  8. Periodic Table Atomic Number Symbol Name Mass Number

  9. Element Symbol Mass Number Symbol Atomic Number

  10. Vocabulary • Electron • Proton • Neutron • Nucleus • Ion • Isotope • Atom • Compound • Atomic Number • Mass Number

  11. Relative Size 1 copper atom = 1.0552 x 10-25 kg on average 69.2% of Cu atoms are 1.04497 x 10-25 kg 30.8% of Cu atoms are 1.07815 x 10-25 kg 1 copper penny = 3.1276 x 10-3 kg 3.1276 x 10-3 kg 1 Cu atom = 2.9640 x 1022 atoms 1.0552 x 10-25 kg

  12. Average Atomic Mass Calcs 1 atomic mass unit (amu) = 1.66054x10-27 kg, Mass of an electron = 9.10939x10-31 kg Mass of a proton = 1.67262x10-27 kg Mass of a neutron = 1.67493x10-27 kg Carbon has 2 common isotopes. 126C and 136C. If the abundance of the two isotopes is 98.89% and 1.11 % respectively, what is the average atomic mass of carbon in amu?

  13. 126C

  14. 136C

  15. Putting It All Together Carbon – 12: 12.09893 amu (98.89% abundance) Carbon – 13: 13.10755 amu (1.11% abundance) (12.09893 amu x 0.9889) + (13.10755 amu x 0.0111) 12.01101 amu

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