The bonding [i.e. electrovalent or covalent] of the oxide of the element in period-3 group 16 [VIA].
Periodic Table
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Answer
Covalent Reason — As the combining atoms i.e., S and O are non-metals and they both have high electron affinity hence they share two pairs of valence electrons in order to complete their octet and attain a stable state and hence form covalent bond.