Answer:
The smallest part of a chemical compound that has all the properties of that compound is a molecule. A molecule is made up of two or more atoms that are chemically bonded together. Molecules can be made up of atoms of the same element, such as O2 (oxygen gas), or they can be made up of different elements, such as H2O (water). Each molecule has its own unique properties, which are determined by the types of atoms in the molecule and the way they are bonded together.