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.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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