Which pair of atoms would form a covalent bond ?
calcium (ca) and bromine (br)
rubidium (rb) and sulfur (s)
cesium (cs) and nitrogen (n)
oxygen (o) and chlorine (cl)

oxygen (O) and chlorine (Cl)

As the electronegativity of an element increases It is more likely to make an ionic bond. e.g. the metallic elements. On the moderate values of electronegativity, elements tend to make covalent bond.

Oxygen and chlorine will make covalent bond because the electronegativity difference between these two elements is 0,5 so there bond will be covalent in nature.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

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