1.Chlorine is placed second after fluorine in group VIIA.
2. Other members of this group are fluorine, bromine, iodine and astatine (the last member is radioactive).
3. Members of this group are called 'halogens' meaning salt producers.
4. Atoms of halogens have seven electrons in their valence shell, thus show -1 valency.
5. Halogens may be solid, liquid or gas.
|Colour||Yellow||Greenish yellow||Reddish brown||Deep purple|
6. The color of halogens becomes darker as we move down the group from fluorine to iodine.
7. The reactivity of halogens decreases as we move down the group. Fluorine is the most reactive element of this group.
8. Halogen acids
All the members of the group VII A form binary haloacids.
HF - Hydrofluoric acid
HCl - Hydrochloric acid
HBr - Hydrobromic acid
HI - Hydroiodic acid
All the members of the group VII A also form oxy-acids.
HClO - Hypochloric acid
HClO2 - Chlorus acid
HClO3 - Chloric acid
HClO4 - Perchloric acid
10. All the members of the group VII A are strong oxidising agents since they have a strong tendency to accept one electron in order to attain an octet.