Group 7, The Halogens/ Brief outline on halides

My teacher asked me to write a brief outline/ summary on the halogens and halides since we recently covered the topic, thought I may aswell share it on here aswell!

If you have the AS AQA Chemistry book this will be good for you!!

HideShow resource information
  • Created by: Sarah
  • Created on: 11-03-13 21:13
Preview of Group 7, The Halogens/ Brief outline on halides

First 176 words of the document:

Group 7, The Halogens
The Halogens are Group 7 on the Periodic Table (highlighted in green), as you would expect:
The size of the atoms increase down the group due to the elements gaining an extra
filled main level of electrons.
Atomic (covalent) radius increases down the group due to a greater number of shells.
Melting and boiling points also increase down the group because the atom gets
bigger and Van Der Waals forces get stronger.
Electronegativity decreases down the group due to the increasing atom size.
Halogens usually react by gaining electrons to become negative ions, these reactions are
Redox reactions; halogens are oxidising agents and are themselves reduced.
Cl2 + 2e- 2Cl
The oxidising ability of the halogens increases as we go up the group.
A displacement reaction occurs when Halogens react with metal Halides in solution in such a
way that the Halide in the compound will be displaced by a more reactive halogen (never by a
less reactive one).

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Halide ions can act as reducing agents; in these reactions the halide ions lose (donate)
electrons and become halogen molecules. There is a trend in the reducing ability which is
linked to the size of the ions. The greater the size of the ion, the more easily an electron is
lost due to the electron being further away on an outer shell which is further from the
Increasing reducing power
F- Cl- Br- I-
Ionic Radius 0.133nm 0.180nm 0.195nm 0.…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »