Calculate %ic of the interatomic bonds for the intermetallic compound al6mn.

We need to know the electronegatives of the elements in the compound which are Al and Mn as the %ic is an electronegative function. 
Electronegative of Al is 1.5
 Electronegative of Mn is 1.6
 %ic = [1 - exp(-0.25)(1.6 - 1.5)^2] x 100
 %ic = [1 - exp(-0.25)(0.01)] x 100
 %ic = 0.25%

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

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