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Germanium is in the fourth period of the Periodic Table. It exhibits two oxidation states GeII and GeIV

This tendency for a lower oxidation state is termed the "inert pair effect".

Looking at the halides GeF2 is a volatile white solid with an unusual structure which does not suggest that the bonding is ionic.

GeCl4 is a covalent molecular compound like CCl4 and SiCl4

the oxides GeO2 and GeO are both known but GeO is unstable disproportionates to GeO2 and metallic germanium. In the oxides the bonding but like silicon oxides, it is best described as covalent.

So in summary Ge2+ and Ge4+ (and these will probably be present in mass spectrometer beams) with the proviso that ions with a 4+ charge in reality are so strongly polarising that they will form bonds with a degree of covalency.

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