Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent?

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Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent?
Arrange the substances with polar covalent bonds in order of increasing bond polarity:
(a) S8
(b) RbCl
© PF3
(d) SC12
(e) F2
(f) SF2.