What are three halogens and describe a property that they all share?
1 Answer
Sep 18, 2017
All halogens are non-metals with seven valence electrons.
Explanation:
Halogens are elements that belong to group VII. They exist as diatomic molecules.
Properties:
- Melting and boiling points increases down the group.
- Halogens form molecular crystals thus their melting points are low
- Halogens are slightly soluble in polar solvents, e.g.
#"H"_2"0"# - Halogens are very soluble in non-polar organic solvents, e.g.
#"CCl"_4, "C"_2"H"_5"OH"# - In a chemical reaction, these non-metals gain an electron to form a univalent negative ion with -1 charge
- Chemical reactivity of the elements decreases down the group, fluorine being the most reactive and astatine being the least reactive.
