Define molecule, divide it into different categories, name and describe each, and give 2 examples for each.

A molecule can be defined as a group of atoms that constitute the shortest and identifiable unit in which a substance is divided.

In conclusion, a molecule can be defined as a group of atoms that constitute the shortest and identifiable unit in which a substance is divided.

Learn more in:

link

Molecules are defined as a combination of two or more same or different atoms bounded together.

Types of molecules are as follows:

Diatomic molecules: A molecules which is consist of only two atoms of different or same elements are called diatomic molecules. Example: O2 and CO.

Heteronuclear diatomic molecules: A molecule that composed of two atoms of the same element is called heteronuclear diatomic molecules. Example: Hydrogen (H2) and Nitrogen (N2).

Homonuclear diatomic molecule: A molecule that composed of two atoms of different elements are called homonuclear diatomic molecule. Example: Hydrochloric acid (HCl) and Hydrogen fluoride (HF).

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.