Elemental gases, except for Noble Gases, come in diatomic molecules. This means they exist as molecules composed of two atoms of the same element.

Here are the diatomic elements:

* Hydrogen (H₂)

* Nitrogen (N₂)

* Oxygen (O₂)

* Fluorine (F₂)

* Chlorine (Cl₂)

* Bromine (Br₂)

* Iodine (I₂)

These elements form diatomic molecules because they are more stable in this configuration. They achieve a full outer shell of electrons by sharing electrons with another atom of the same element.