Explain the bonding in a metal complex, compare this to an ionic compound and covalent bonding

Metal complexes are kept together by a 'sea' of free electrons holding the negatively charged metal ions togetherCOMPARED TOIonic - positive ions and negative ions held together in a complex by electrostatic attractions - STRONG
Covalent - no charges involved, overlap of orbitals on atoms - electrons are shared between 2 or more atoms, very strong