Complete the exercises below. For each of the following molecules or polyatomic ions, draw the Lewis structure and indicate if it can act as a monodentate ligand, a bidentate ligand, or is unlikely to act as a ligand at all: a. ethylamine, CH₃CH₂NH₂, b. trimethylphosphine, P(CH₃)₃.

Lewis structures are diagrams that represent the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They help visualize the arrangement of electrons and the connectivity of atoms, which is crucial for understanding molecular geometry and reactivity. Drawing Lewis structures involves determining the total number of valence electrons and distributing them to satisfy the octet rule for each atom.

Ligands are ions or molecules that can donate a pair of electrons to a central metal atom to form a coordination complex. They can be classified as monodentate, which bind through a single atom, or bidentate, which can attach through two atoms. Understanding the nature of ligands is essential for predicting the behavior of coordination compounds in various chemical reactions.

The coordination number refers to the number of ligand donor atoms that are bonded to a central metal atom in a coordination complex. This concept is important for determining the geometry of the complex and its stability. For example, a metal with a coordination number of 2 typically forms linear complexes, while a coordination number of 4 can lead to tetrahedral or square planar geometries.