High School Physics + more

The Halogen Group – a general idea

The Halogen Group is One of the most reactive groups in the periodic table, this set includes non-metals. The name “halogen” means “salt former”, which refers to the way that elements in this group react with metals to form salts, such as sodium chloride, widely known as common salt.

Tennessine (Ts) is an artificial halogen.

Atomic structure

All members have seven electrons in the outer shell of each atom. There is space for one more electron in each outer shell

Physical properties

Bromine (Br) is the only halogen that is liquid.

Fluorine (F) and chlorine (Cl) are gases, while iodine and astatine (At) are solids.

Chemical properties

Every halogen atom receives one electron from other atoms to form a compound. Reactivity decreases down the group.


The halogens react with hydrogen (H) to form acidic compounds. Halogen compounds are used in products such as bleach.

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