4.
Wide-angle camera lenses, fibre optic cables, and integrated circuits all contain Germanium.
Many simple organic compounds can have germanium substituted for some or all of the carbon. This gives many thousands of different molecules.
Any household items contain chlorophyll.
Household items doesn't contain polonium.
Optical fibre systems, infra red optics, polymerisation catalysts and solar electronics.
the group 4A elements
Any household items contain technetium.
Germanium compounds are toxic.
+-*
None
Germanium does no "do" anything.