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classify the compound as having ionic, polar covalent, or pure covalent bonds.

Sb2P5

I know that a metal and nonmetal form an ionic bond, and two nonmetals form covalent bonds. The trouble I am having is that Sb is a metalliod and when it forms with a non-metal, what kind of bond is formed?

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Sb has an electronegativity of 2.05 and that of P is 2.19. The arbitrary rule is that a difference of about 1.9 or so makes it ionic; less than that is covalent or polar covalent. The two elements are so close together I think you have a good case for almost pure covalent.
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