Halogens and inter halogen compounds

1. Halogens and Interhalogens
Dr. Mithil Fal Desai
Shree Mallikarjun and Shri Chetan Manju Desai College
Canacona Goa

2. s
bloc
k
d block
p
block
Halogens
f
block
Where are Halogens in periodic table?

3. Atomic
number
Halogen Symbol State (at
Rt)
Electronic
configuration
9 Fluorine F Gas [He]2s22p5
17 Chlorine Cl Gas [Ne]3s23p5
35 Bromine Br Liquid [Ar] 3d104s24p5
53 Iodine I Solid [Kr] 4d105s25p5
85 Astatine At Solid [Xe] 4f145d106s26p5
Halogens

4. Halogen F Cl Br I
F F2 ClF, ClF3ClF5 BrF, BrF3, BrF5 IF, IF3, IF5, IF7
Cl Cl2 BrCl ICl, (ICl3)2
Br Br2 IBr
I I2
AX, AX3, AX5, AX7
Types of Interhalogens

5. Preparation of Interhalogens
Eg. I2+ F2 2 IF
Eg. Cl2+ 3F2 2 ClF3
Direct
combination

6. Preparation of Interhalogens
Cl2+ ClF3 3 ClF
Br2+ BrF3 3 BrF
I2+ AgF IF + AgI
I2+ KClO3 ICl + KIO3
Direct
combination &
other methods
AX
I2+ 3Cl2 2 ICl3
I2+ 3F2 2 IF3
I2 + 3 XeF2 → 2 IF3 + 3 Xe
Br2 + 5 F2 → 2 BrF5
KBr + 3 F2 → BrF5 + KF
Cl2 + 5F2 → 2ClF5
I2 + 5 F2 → 2 IF5
IF5 + F2 → IF7
AX3
AX5
AX7