Bonding of atoms

Describe covalent and ionic bonding.
      Covalent bonding- is more of a sharing of electrons between two atoms
      Ionic bonding- is the giving of electrons from an atom with a low electronegativity value to an atom with a high electronegativity value

What is electronegativity?
      Shows how much an atom wants electrons

List the electronegativity values for:
      H- 2.1
      Na- 0.9
      Cl- 3.0
      O - 3.5