The elements Z=117 and 120 have not yet been discovered. In which family/group would you place these elements and also give the electronic configuration in each case.
Based on the periodic table structure, the element with Z=117 would belong to the halogen family (Group 17). The electronic configuration for this undiscovered element would be [Rn] .
Similarly, the element with Z=120 will be placed in Group 2 (alkaline earth metals). The electronic configuration for this element will be [Uuo] . Elements in the same vertical column or group have similar valence shell electronic configurations and similar properties, which justifies their placement in these respective groups.
Explanation
The context directly provides the group placement and electronic configurations for elements Z=117 and Z=120. Z=117 falls under Group 17 (halogens) with configuration [Rn] , while Z=120 falls under Group 2 (alkaline earth metals) with configuration [Uuo] .