1. Masses of Atoms Pages 550 - 553

2. Element ~ matter that is unique from all others, because of different numbers of protons.

3. Symbol ~ unique letter to represent element

4. Element ~ matter that is unique from all others, because of different numbers of protons. Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element

5. Element ~ smallest particle that is unique from all others Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Carbon - 12 (6 protons, 6 neutrons) Carbon - 14 (6 protons, 8 neutrons)

6. Element ~ matter that is unique from all others, because of different numbers of protons. Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Atomic Mass ~ number of neutrons AND number of protons Isotope ~ atoms of the same element, with different numbers of neutrons

7. Element ~ smallest particle that is unique from all others Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Atomic Mass ~ number of neutrons AND number of protons Isotope ~ atoms of the same element, with different numbers of neutrons Carbon - 12 (6 protons, 6 neutrons) Carbon - 14 (6 protons, 8 neutrons) SAME ELEMENT, DIFFERENT NEUTRON NUMBERS

8. Element ~ matter that is unique from all others, because of different numbers of protons. Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Atomic Mass ~ number of neutrons AND number of protons Isotope ~ atoms of the same element, with different numbers of neutrons Atomic Mass Unit ~ 1/12 th of the mass of one carbon-12 atom

9. Element ~ matter that is unique from all others, because of different numbers of protons. Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Atomic Mass ~ number of neutrons AND number of protons Isotope ~ atoms of the same element, with different numbers of neutrons Atomic Mass Unit ~ 1/12 th of the mass of one carbon-12 atom The periodic table shows the atomic mass of Nickel as 58.693. How can there be a decimal point, if the mass is whole numbers of protons and neutrons?

10. Element ~ smallest particle that is unique from all others Symbol ~ unique letter to represent element Atomic Number ~ number of protons in the atom of an element Atomic Mass ~ number of neutrons AND number of protons Isotope ~ atoms of the same element, with different numbers of neutrons Atomic Mass Unit ~ 1/12 th of the mass of one carbon-12 atom The periodic table shows the atomic mass of Nickel as 58.693. How can there be a decimal point, if the mass is whole numbers of protons and neutrons?

11. Example, with boron. Facts: Boron has an accepted amu of 10.811 80% of Boron in nature have 5 protons, 6 neutrons ~ 11 amu 20% of Boron in nature have 5 protons, 5 neutrons ~ 10 amu (.8 11 amu) + (.2 10 amu) = 8.8 amu + 2 amu = 10.8 amu There are a few extra isotopes out there that we did not include.

12. Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of course) 28 protons. PercentNumberNumber Atomic inof ofmass Isotopenature protonsneutronsunits Ni-5869%283058 Ni-6027%283260 Ni-624%283462 What, given this information, is the approximate atomic mass of Nickel?

13. Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of course) 28 protons. PercentNumberNumber Atomic inof ofmass Isotopenature protonsneutronsunits Ni-5869%283058 Ni-6027%283260 Ni-624%283462 (.69 58) + (.27 60) + (.04 62) = 58.7 amu