1. What 4 elements make up 96% of body weight?
    • 1. Carbon
    • 2. Oxygen 
    • 3. Hydrogen 
    • 4. Nitrogen
  2. Atomic Number:
    The number of protons an atom contains
  3. Atomic Mass:
    The sum of the masses of all the protons and neutrons
  4. Isotopes:
    Have the same number of protons and electrons but vary in the number of neutrons they contain
  5. Radioisotopes:
    Unstable isotopes
  6. Molecules:
    Two or more atoms combined chemically
  7. Compound:
    Two or more different atoms combine chemically
  8. Ions:
    An atom that has either gained or lost and electron
  9. Ionic Bond:
    Electrons are completely transferred from one atom to another
  10. Anions:
    • Negatively charged ions
    • - Atom gains an electron
  11. Cations:
    Positively charged ions

    - Atom losses an electron
  12. Covalent Bond:
    Electrons are shared with one atom to another

    • Two types:
    • -Non Polar 
    • -Polar
  13. Non Polar Covalent Bond
    Electrons are equally shared
  14. Polar Covalent Bond
    Electrons are unequally shared
  15. Hydrogen Bond:
    -Most common in water

    - Extremely weak bond
  16. Synthesis Reaction:
    When two or more atoms or molecules combine to form a larger more complex molecule

  17. Decomposition Reaction:
    When a molecule is broken down into smaller molecules or atoms

    AB→ A+B
  18. Exchange Reactions:
    Involves both synthesis and decomposition reactions 

Card Set
Basic Chemistry