A delta () bond is an advanced type of covalent bond formed by the simultaneous overlap of four lobe — Chemical Bonding Chemistry Question

💡 Solution & Explanation

A $\delta$ -bond is formed by the sideways face-to-face overlap of the four lobes of two $d$ -orbitals, such as $d_{xy}-d_{xy}$ or $d_{x^2-y^2}-d_{x^2-y^2}$ (in parallel planes). It is present in species like the $[Re_2Cl_8]^{2-}$ ion.