Types of Molecular Bonds

Which of the following sets of atoms correctly identifies the type of bonding that would occur between them?

Atom 1Atom 2Type of bondingI.SSMetallicII.SOCovalentIII.SNaIonic\begin{array}{c:c:c:c} &\rm Atom\ 1&\rm Atom\ 2&\rm Type\ of\ bonding\\ \hline \rm I. &S&S&\rm Metallic \\ \hline \rm II. &S& O&\rm Covalent \\ \hline \rm III. &S &Na&\rm Ionic \end{array}
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