Group 7 - The halogens
- Created by: x_sherlocked_x
- Created on: 06-05-14 19:42
View mindmap
- Group 7 - The halogens
- They are non - metallic elements in group 7 of the periodic table
- They exist as small molecules made up of pairs of atoms.
- They have low melting and boiling points that increase going down the group.
- At room temperature: Fluorine=pale yellow gas. Chlorine=green gas. Bromine=red-brown liquid. Iodine=grey solid (vaporises to form violet gas.).
- All halogens have 7 electrons in their outer shell.
- The halogens form ionic compounds with metals in which the halide ions have a charge of 1-.
- The halogens also bond covalently with non-metals, forming moolecules.
- The reactivity of halogens decreases going down the group. A more reactiev halogen is able to displace a less reactive halogen from an aqueous solution of an halide compound.
- The reactivity decreases going down the group because the attraction of the outer electrons to the nucleus decreases as the number of occupied energy shells increases.
Comments
Report