[填空题]
The valence electrons in [size=1.21em]I2IX2 are farther from their nuclei than the valence electrons in [size=1.21em]Cl2ClX2. Explain how the size of the atoms in a covalent bond can affect the relative attraction to electrons and hence the bond's polarity.
2.Calculate the electronegativity differences in the following compounds $Cl_2$,HCl,and NaCl
(Refer to Table 8 from the data booklet) .
$Cl_2$:the electronegativity difference is ,
HCl:the electronegativity difference is ,NaCl:the electronegativity difference is
$Cl_2$,HCl,and NaCl (Refer to Table 8 from the data booklet) .
