Electronic Structure H The sigma bond is sp-sp overlap H H spX sp The two pi bonds are unhybridized p overlaps at 90, which blend into a cylindrical shape H H =(H bond>C C<o bond H overlap of p orbitals cylinder of electron densityChapter 9 11 Electronic Structure • The sigma bond is sp-sp overlap. • The two pi bonds are unhybridized p overlaps at 90, which blend into a cylindrical shape. =>