Question

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)

Explanation:

Step1: Recall covalent - bond concept

Covalent bonds form between non - metals.

Step2: Analyze each option

Calcium (Ca) is a metal, bromine (Br) is a non - metal, forms ionic bond. Rubidium (Rb) is a metal, sulfur (S) is a non - metal, forms ionic bond. Cesium (Cs) is a metal, nitrogen (N) is a non - metal, forms ionic bond. Oxygen (O) and chlorine (Cl) are both non - metals, form covalent bond.

Answer:

Oxygen (O) and chlorine (Cl)