CBSE Class 10 Answered

HCl is polar covalent compound. It has one covalent bond. This works because hydrogen only needs 2 valence electrons(electrons on outside) for it to be complete. The chlorine atom is also complete because it had 7 valences and needed one, which it received from the hydrogen atom.

If the atoms are equally electronegative, both have the same tendency to attract the bonding pair of electrons, and so it will be found on average half way between the two atoms. To get a bond like this, A and B would usually have to be the same atom. You will find this sort of bond in, for example, H2 or Cl2 molecules.

This sort of bond could be thought of as being a "pure" covalent bond - where the electrons are shared evenly between the two atoms.