* Hydrogen (H) - Found in Group 1.
* Nitrogen (N) - Found in Group 15.
* Oxygen (O) - Found in Group 16.
* Fluorine (F) - Found in Group 17.
* Chlorine (Cl) - Found in Group 17.
* Bromine (Br) - Found in Group 17.
* Iodine (I) - Found in Group 17.
These elements all exist as diatomic molecules because they are highly reactive and achieve a more stable electron configuration by sharing electrons with another atom of the same element.
