The elements of group 7 of the periodic table are called halogens.
Halogens means “Salt producer”. They react with acids to form salts. Example include; fluorine (F), chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At).
They exist as diatomic molecules and they all have 7 electrons in the valence shell.
|
Element
|
Symbol
|
State at room temperature
|
Electronic configuration
|
Color
|
|
Fluorine
|
F2
|
Gas
|
2:7
|
Pale yellow
|
|
Chlorine
|
Cl2
|
Gas
|
2:8:7
|
Greenish yellow
|
|
Bromine
|
Br2
|
Liquid
|
|
Reddish brown (only liquid non-metal)
|
|
Iodine
|
I2
|
Solid
|
|
Shiny black
|
|
Astatine
|
At2
|
Solid
|
|
violet
|
Halogens are the most reactive non-metals. Reactivity increases up the group.
