Answer:
s-s overlapping (Formation of hydrogen molecule): Each hydrogen atom has one electron in 1s-orbital which is
spherical. 1s-orbital of both the hydrogen atoms approach each other closely
and when they reach a point of maximum attraction by the two nuclei, they
overlap and form a sigma bond.
The bond has two electrons which
have opposite spins. The probability of finding these electrons is maximum in
the region between the two nuclei on the molecular axis. The electron density
of the bond is distributed symmetrically about the molecular axis.
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