The analytical Hartree-Fock method for determining the ground state of Li can be extended to Be, B and C. The energy equations to minimise using Excel Solver for Be, B and C are

respectively; where .

The results for Be are

The final theoretical value of has a deviation of about 0.76% versus the experiment data of the ground state of Be.

The results for B are

The final theoretical value of has a deviation of about 0.65% versus the experiment data of the ground state of B.

The results for C are

The final theoretical value of has a deviation of about 0.66% versus the experiment data of the ground state of C.