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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