Even in a molecule where the electrons are shared pretty evenly, they can collide to one atom and produce a momentary dipole moment. Temporary dipoles<span> are created when electrons, which are in constant movement around the nucleus, spontaneously come into close proximity. </span>
There are 8 moles. I hope this helps you out.
The answer is chemical weathering .
The electronic configuration of the elements which share the group, must have the last electron in same block..