# Molecules and Compounds A **molecule** is a small particle made up of two or more [[Atoms and Elements|atoms]] that are [[Chemical Bonds|chemically bonded]] together. A **compound** is a *type of molecule* that is made up of *two or more unique elements*. The properties of a molecule are determined by the type of atoms they contain and it’s **molecular structure**. ## Molecular Structure > See also: > - [[Electrons]] > - [[Molecular Representations]] [[Stability of Carbocations]] > **Electron Geometry:** Refers to how electrons are arranged in space > > **Molecular Geometry:** Refers to the three-dimensional arrangement of atoms that make up a molecule The electron geometry depends on the structure of the electrons of the central atom of a molecule, while the molecular geometry depends on whether other atoms are attached to the central atom or if there are pairs of free electrons. ### Molecular Orbital (MO) Theory Molecular orbital theory … Anti-bonding ### Valence Shell Electron Pair Repulsion (VSEPR) The **VSEPR Theory** model theorizes that regions of negative electric charge will repel each other, causing them (and the chemical bonds that they form) to stay as far apart as possible. It can be used to depict the 3D structure of a chemical compound given its bonds > [!NOTE]+ VSEPR Theory Table > A - Central Atom > X - Bonded Atoms > E - Lone Pair Electrons > ![[Pasted image 20220830194008.png|450]] ![[Hybridization Bond Angles.png|300]]