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4. Using Paulings electronegativity (0) values from the Chemistry Data Sheet or the textbook, (a) calculate Ax for NaCl and

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4)- a) Na=0.9 and Cl=3.0

∆X=3.0 - 0.9 = 2.1

H=2.1 and Cl=3.0

∆X= 3.0 - 2.1 = 0.9

4)- b) NaCl has ∆X =2.1 > 2.0 which means it is an ionic compound .

Whereas HCl has ∆X = 0.9 < 2.0 which means it is a polar covalent compound.

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