The orbit with the highest energy level of the occupied electron is called the highest occupied molecular orbit, and is represented by HOMO. The orbit with the lowest energy level of the unoccupied electrons is called the lowest unoccupied molecular orbit and is denoted by LUMO. HOMO and LUMO are collectively referred to as the front-line orbit, and the electrons on the front-line orbit are called the front-line electrons. Computation of EA https://wavefunction.alfa-chem....istry.com/services/c