In which element group of the periodic table are fluorine, chlorine, bromine and iodine included?

Halogen

The correct answer is option 4. Halogen.

The elements fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) are included in the Halogen group of the periodic table.

The halogens are a group of elements found in Group 17 (VIIA) of the periodic table. The word "halogen" itself is derived from Greek words meaning "salt-former," highlighting their ability to form salts when they react with metals.

Members of the Halogen Group:

The halogen group includes the following elements:
Fluorine (F)
Chlorine (Cl)
Bromine (Br)
Iodine (I)
Astatine (At) - Astatine is a less common halogen and is often considered a halogen in the broader context, although its scarcity makes it less studied.

In summary, fluorine, chlorine, bromine, and iodine are grouped together as halogens due to their similar chemical properties and placement in Group 17 of the periodic table.