Which Group 16 elements can form ionic compounds with nonmetals?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — oxygen group element Modern version of the periodic table of the elements (printable).

Within the oxygen group (Group 16), the elements oxygen, sulfur, and selenium do not form purely ionic bonds with nonmetal atoms.1

However, the heavier members of the group, tellurium and polonium, are capable of forming a limited number of compounds that exhibit somewhat ionic character when bonded with other elements. Examples of such compounds include tellurium(IV) sulfate, ${Te(SO}_{4})_{2}$ , and polonium(II) sulfate, ${PoSO}_{4}$ .1