In the covalent bond between hydrogen and chlorine in the hcl molecule, where will the majority of shared electrons be found?

Nearer to the chlorine as it has a greater electronegativity 

In covalent bonds, majority of shared electron is towards element with more electronegativty. Since Cl is more electronegative than H, shared electrons will be towards Cl.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

The correct answer would be b) volume versus temperature, because they are also directly proportional.