11. CNDO is considered to yield good results for lowest unoccupied molecular orbital are reported from the closed shell approach. 12. The chlorine in the perchlorate anion is a closed shell atom and is well protected by the four oxygens. 13. When buying hard-shell clams, remember that live ones have tightly closed shells ; reject any whose shells are open or cracked. 14. Unlike restricted Hartree & ndash; Fock theory for closed shell molecules, the form of the Fock matrix is not unique. 15. If Z = 114 does represent a closed shell , then the hypothetical reaction below may represent a method of synthesis: 16. For example the Au 102 ( p-MBA ) 44 has 58 electrons and corresponds to a closed shell magic number. 17. The quantum theory of the atom explains the eight electrons as a closed shell with an s 2 p 6 electron configuration. 18. This is not surprising as in contrast to F " an ion S " is not a closed shell species. 19. There are however problems with the shell model when an attempt is made to account for nuclear properties well away from closed shells . 20. In another meaning a closed shell configuration corresponds to state with all molecular orbitals doubly occupied or empty ( a singlet state ).
