It is difficult to use the de Haas-van Alpen effect to determine Fermi surface parameters of compounds containing these substances, as the presence of upwards of 20 conduction electrons confounds analysis.  
It is difficult to use the de Haas-van Alpen effect to determine Fermi surface parameters of compounds containing these substances, as the presence of upwards of 20 conduction electrons confounds analysis.  Consumption of these substances may be treated with a combination of penetate calcium disodium and siderophore analogues to minimize their bonding to endosteal bone surfaces and subsequent bone tumor formation. These substances are often isolated by reducing their tri- or tetra-fluorides at high temperatures in the presence of lithium or calcium.  A Mott transition within this group explains a switch from high-symmetry to low-symmetry crystal structures and from relatively localized to itinerant 5f electrons. For 10 points, name this series of elements that includes thorium and uranium and is found below the lanthanide series on the periodic table.
It is difficult to use the de Haas-van Alpen effect to determine Fermi surface parameters of compounds containing these substances, as the presence of upwards of 20 conduction electrons confounds analysis.  
actinides or actinoids