This document discusses the basics of chemistry including:
1) Atoms are made up of electrons, protons and neutrons that form different elements. Elements can bond together through ionic bonds, covalent bonds, or hydrogen bonds to form molecules and compounds.
2) Covalent bonds form when atoms share electrons to achieve a full outer electron shell. Ionic bonds form when atoms transfer electrons to become ions that are attracted to each other. Hydrogen bonds occur when a hydrogen atom bonded to an electronegative atom interacts with another.
3) The shape and properties of molecules are determined by the arrangement of atoms and bonding orbitals. Chemical reactions convert reactants into different molecular products.