One reason spectroscopists study excited states is to gain information

One reason spectroscopists study excited states is to gain information about the energies of orbitals that are unoccupied in an atom’s ground state. Each of the following electron configurations represents an atom in an excited state. Identify the element, and write its condensed ground-state configuration:

a) 1s22s22p63s13p1,
b) 1s22s22p63s23p44s1,
c) 1s22s22p63s23p64s23d44p1,
d) 1s22s22p53s1