These are all diatomic elements. This means they exist naturally as molecules made up of two atoms of the same element bonded together.

Here's a breakdown:

* Hydrogen (H2): Two hydrogen atoms bonded together.

* Nitrogen (N2): Two nitrogen atoms bonded together.

* Oxygen (O2): Two oxygen atoms bonded together.

* Fluorine (F2): Two fluorine atoms bonded together.

* Chlorine (Cl2): Two chlorine atoms bonded together.

* Iodine (I2): Two iodine atoms bonded together.

* Bromine (Br2): Two bromine atoms bonded together.

Remember, these elements are called diatomic because they always appear in pairs in their natural state.