Chemical Bonding Worksheet With Answers Page 10
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122.19
Compute the percents ionic character of the interatomic bonds for the following compounds: TiO
,
2
ZnTe, CsCl, InSb, and MgCl
.
2
Solution
The p ercent io nic ch aracter is a fu nction o f th e electro n n egativities o f th e io ns X
and X
according to
A
B
Equation 2.10. The electronegativities of the elements are found in Figure 2.7.
For
TiO
, X
= 1.5 and X
= 3.5, and therefore,
Ti
O
2
⎡
⎤
(− 0.25)(3.5−1.5) 2
%IC = 1 − e
× 100 = 63.2%
⎣ ⎢
⎦ ⎥
For
ZnTe, X
= 1.6 and X
= 2.1, and therefore,
Zn
Te
⎡
⎤
(− 0.25) (2.1−1.6) 2
%IC = 1 − e
× 100 = 6.1%
⎣ ⎢
⎦ ⎥
Fo
r CsCl, X
= 0.7 and X
= 3.0, and therefore,
Cs
Cl
⎡
⎤
(− 0.25)(3.0− 0.7) 2
%IC = 1 − e
× 100 = 73.4%
⎣ ⎢
⎦ ⎥
For
InSb, X
= 1.7 and X
= 1.9, and therefore,
In
Sb
⎡
⎤
(− 0.25)(1.9−1.7) 2
%IC = 1 − e
× 100 = 1.0%
⎣ ⎢
⎦ ⎥
For
MgCl
, X
= 1.2 and X
= 3.0, and therefore,
Mg
Cl
2
⎡
⎤
(− 0.25)(3.0−1.2) 2
%IC = 1 − e
× 100 = 55.5%
⎣ ⎢
⎦ ⎥
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