Which pair of elements is most apt to form a molecular compound with each other?

Name: Which pair of elements is most apt to form a molecular compound with each other?
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Question

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Sulfur and fluorine are both nonmetals and have similar electronegativities, which makes them likely to form a covalent bond with each other to fulfill their octet rule. The other pairs consist of a metal and a nonmetal, which are more likely to form an ionic compound.

Which Pair of Elements Is Most Apt to Form a Molecular