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Ionic Radius :

The force of attraction or repulsion, F, between two charges qC (charge on cation) and qA (charge on anion) separated by a distance d (sum of ionic radii of two ions) is given by Coulomb’s law as

Where D = dielectric constant.

d = radius of cation + radius of anion as shown in figure.

Figure 7 Ionic radii

Table 6 Ionic Radii (in 0 A)

CATIONS

ANIONS

Group I A

Group II A

Group III A

Group VI A

Group VII A

E

R

E

R

E

R

E

R

E

R

Li+

0.60

Be2-

0.31

 

 

O2-

1.4

F-

1.36

Na-

0.95

Mg2+

0.65

A13+

0.50

S2-

1.84

Cl-

1.81

K+

1.33

Ca2+

0.99

Ga3-

0.62

Se2-

1.98

Br-

1.95

Rb+

1.48

Sr2+

1.13

In3+

0.81

Te2-

2.21

r-

2.16

Cs+

1.69

Ba2-

1.35

Ti3+

0.95

 

 

 

 


[next page]

Index

4.1 Introduction
4.2 The Ionic Bonds
4.3 The Covalent Bonds
4.4 The Polar Bonds
4.5 Electronegativity
4.6 Others Bonds

Chapter 5





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