18
Group 17 (VIIIA) Halogens F, Cl, Br, I and At
INTRODUCTION
The elements F, Cl, Br, I and At (Astatine) are called halogens (Greek, ‘Halos’-salt and ‘gene’ — born, i.e., salt forming).
Table 18.1
| Elements | Atomic Number | Electron Configuration |
|---|---|---|
Fluorine (F) |
9 |
2[He] 2s22p5 |
Chlorine (Cl) |
17 |
10[Ne] 3s23p5 |
Bromine (Br) |
35 |
18[Ar] 3d104s24p5 |
Iodine (I) |
53 |
36[Kr] 4d105s25p5 |
Astatine (At) |
85 |
54[Xe] 4f14 5d106s26p5 |
All the elements of this group are non-metallic. Iodine is solid and has some metallic lusture. Astatine (At) is radioactive and does not occur in nature. It can be made by nuclear reaction,
The t ½ of 211At is 7.5 hrs. ...
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