Check all of the following combinations of elements that could form a covalent bond. Cand H Ba and O KardF Wand CI Hands

To determine if the given combinations of elements can form a covalent bond, we need to consider the general tendency of each element to either share electrons (covalent bonding) or transfer electrons (ionic bonding). Covalent bonds typically form between nonmetals, as they tend to share electrons to achieve a full valence shell. Let's examine each pair:1. (Carbon) and (Hydrogen):Both carbon and hydrogen are nonmetals. Carbon has 4 valence electrons and needs 4 more to complete its octet, while hydrogen has 1 valence electron and needs 1 more to complete its duet (since it's an exception to the octet rule). They can share electrons to achieve stable configurations, so they can form a covalent bond.2. Ba (Barium) and O (Oxygen):Barium is an alkaline earth metal with 2 valence electrons, and oxygen is a nonmetal with 6 valence electrons. Metals like barium tend to lose electrons to achieve a stable configuration, while nonmetals like oxygen tend to gain electrons. This pair is more likely to form an ionic bond rather than a covalent bond.3. K (Potassium) and F (Fluorine):Potassium is an alkali metal with 1 valence electron, and fluorine is a halogen with 7 valence electrons. Similar to the previous pair, potassium tends to lose its valence electron, and fluorine tends to gain an electron to achieve a stable configuration. This pair is also more likely to form an ionic bond rather than a covalent bond.4. (Nitrogen) and (Chlorine):Both nitrogen and chlorine are nonmetals. Nitrogen has 5 valence electrons and needs 3 more to complete its octet, while chlorine has 7 valence electrons and needs 1 more. They can share electrons to achieve stable configurations, so they can form a covalent bond.5. H (Hydrogen) and S (Sulfur):Both hydrogen and sulfur are nonmetals. Hydrogen has 1 valence electron and needs 1 more to complete its duet, while sulfur has 6 valence electrons and needs 2 more to complete its octet. They can share electrons to achieve stable configurations, so they can form a covalent bond.Final Answer:The combinations of elements that could form a covalent bond are:- and - and - H and S