Chem 2: Lec 5

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dante01
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307782
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Chem 2: Lec 5
Updated:
2015-09-14 03:01:59
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chemistry
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  1. Determine the number of protons and neutrons in each of the following isotopes:
  2. Write Isotope symbols for the following pairs:
    1. carbon-13 and carbon 14
    2. chlorine-35 and chlorine-37
    3. uranium-235 and uranium-238
    4. lithium-6 and lithium-7


  3. Ions
    • -differ from atoms in that they have a charge
    • -either greater than, or less than, the number of protons
  4. Cations
    • -positively charged
    • -have fewer electrons
  5. Anions
    • -negatively charged
    • -have more electrons
  6. Write the number of protons and electrons for the following ions:

    O2-
    Al3+
  7. Write the symbol for the ion that has the following number of protons and electrons:
    1. 20 protons and 18 electrons
    2. 16 protons and 18 electrons
    3. 26 protons and 23 electrons
  8. Alkali metals
    • -are considered reactive because they react readily with other elements
  9. Alkaline earth metals
    • -are more reactive than the transition metals but less reactive than alkali metals
  10. Halogens
    • -exists naturally as diatomic molecules
  11. Noble gases
    • -inert gases
    • -most do not chemically react with other elements

  12. Diatomic Elements on Periodic table

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