Not a Metal:

• Iodine

Explanation:
Iodine is not a metal. It is a non-metal element that belongs to group 17 of the periodic table. Non-metals are elements that are poor conductors of heat and electricity, unlike metals which are good conductors. Iodine is a halogen, along with elements like chlorine and fluorine, and is typically a purple-black solid at room temperature. It is commonly used in medicine, photography, and as a disinfectant.
On the other hand, uranium and mercury are both metals. Uranium is a radioactive metal that is commonly used in nuclear power plants and weapons. It is a heavy metal with a high density. Mercury is a liquid metal at room temperature and is known for its unique properties like high density and low melting point. It is commonly used in thermometers, barometers, and some electrical switches.
In summary, iodine is not a metal, while uranium and mercury are metals with different properties and uses.

Iodine is a non metal here