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Masses of Atoms Pages 550 - 553 Element ~ matter that is unique from all others, because of different numbers of protons. Element ~ matter that is unique from all others, because of different numbers of protons. Symbol ~ unique letter to represent element 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 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) 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 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 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 ~ 1/12th of the mass of one carbon-12 atom 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 ~ 1/12th 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? 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 ~ 1/12th 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? 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. Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of course) 28 protons. Percent Number Atomic in of mass Isotope protons neutrons Number of nature units Ni-58 69% 28 30 58 Ni-60 27% 28 32 60 Ni-62 4% 28 34 62 What, given this information, is the approximate atomic mass of Nickel? Nickel, in nature, has 8 (pretty) stable isotopes. Each has (of course) 28 protons. Percent Number Atomic in of mass Isotope protons neutrons Number of nature units Ni-58 69% 28 30 58 Ni-60 27% 28 32 60 Ni-62 4% 28 34 62 (.69 • 58) + (.27 • 60) + (.04 • 62) = 58.7 amu