Bio1151 Chapter 2 The Chemical Context of Life
  1. Matter consists of chemical           in pure form and in combinations called compounds.

  2. Each element contains a single kind of atom made of           ,          , and            .

  3. Electrons occupy different         with different energy         . The outermost, or          , shell contains          electrons.

  4. A           bond is the          of a pair of          electrons between different atoms of a           . These bonds are strong and stable.

  5. In a        covalent bond the atoms have different electronegativities and share the electrons            .

  6. In an        bond, charged atoms called       are formed.

  7. Electronegativity can also result in other weak chemical interactions.
    • A           bond forms from the attraction of charged regions of        molecules.

    •                interactions form when transiently charged regions of molecules attract each other.