atom_number      61   61.0
electron_config  18   srel  restricted
    1s   2.0   1
    2s   2.0   1
    2p   6.0   1
    3s   2.0   1
    3p   6.0   1
    3d  10.0   1
    4s   2.0   1
    4p   6.0   1
    4d  10.0   1
    4f   5.0   1
    5s   2.0   1
    5p   6.0   1
    5d   0.0   1
    5f   0.0   0
    6s   2.0   1
    6p   0.0   0
    6d   0.0   0
    6f   0.0   0
