Answer
Mn: manganese
In: indium
Fr: francium
Po: polonium
Work Step by Step
The element located at the intersection of Group 7B and Period 4 is manganese, which has the symbol Mn.
The element located at the intersection of Group 3A and Period 5 is indium, which has the symbol In.
The element located at the intersection of Group 1A and Period 7 is francium, which has the symbol Fr.
The element located at the intersection of Group 6A and Period 6 is polonium, which has the symbol Po.
