The table below shows the electronegativity values of various elements on the periodic table. electronegativities 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)

Electronegativity is a measure of the capacity of an atom to attract a bonding pair of an electron from another atom.

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.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.