Portfolio chem.docx - Unit 3 Portfolio Modification Atoms...

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Unit 3 Portfolio Modification: Atoms and Elements (30 points) This covers parts of chapters 4, 5, and 6 in your textbook. A. Fill in the following table (0.5 points each) Mass (amu) Charge Location Proton 1.00727647 u +1 Nucleus Neutron 1.008665 u 0 Nucleus Electron 0.0005488 u -1 Around the nucleus Define the following and give an example (0.5 points each): 1. Atomic number: 2. Mass number: 3. Average atomic mass: 4. Isotope: B. Fill in the following table (0.5 points each): Element name Element symbol Atomic number Protons Neutrons (in most common isotope) Atomic mass (amu) Electrons Hydrogen 8 8 18 17 Mg 12 24.305 5. (2 points) Lithium has two isotopes, lithium-6 (atomic mass = 6.015, relative abundance = 7.5%) and lithium-7 (atomic mass = 7.016, relative abundance = 92.5%). Calculate the atomic mass of lithium. (SHOW YOUR WORK)
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Write the electron configuration for the following elements (1 point each): Example: Carbon: 1s2, 2s2, 2p2. Chlorine: 1s2, 2s2, 2p6, 3s2, 3p5 6. Argon: 7. Calcium: 8. Why does the 4s sublevel fill before the 3d sublevel begins to fill as electrons are added? Think about the energy levels involved.
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