To determine which two elements are most likely to form covalent bonds, we can look at their positions in the periodic table. Covalent bonds typically form between nonmetals or between nonmetals and metalloids.
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Potassium (K) is an alkali metal, while iodine (I) is a nonmetal. The bond formed between them would primarily be ionic.
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Nitrogen (N) and oxygen (O) are both nonmetals and are located relatively close to each other in the periodic table. They are likely to form covalent bonds based on their electronegativities and their ability to share electrons.
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Magnesium (Mg) is a metal and sulfur (S) is a nonmetal. They would likely form an ionic bond rather than a covalent bond.
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Sodium (Na) is also a metal, while bromine (Br) is a nonmetal. This pair would also likely form an ionic bond.
Considering these points, the pair most likely to form covalent bonds is:
Nitrogen (N) and Oxygen (O).