Yes, they are reactive to nature.
It's over 9000.
Mendeleev was able to predict the properties of the yet unknown element (Germanium) by the properties of the surrounding known elements on his periodic table of the elements. Predicting properties such as reactivity, density, atomic mass, etc., he knew where the undiscovered element would be placed.
Germanium compounds are toxic.
Germanium does no "do" anything.
Germanium is not manufactured; its ore is mined then refined into germanium.
golds reactivity is very low in the reactivity series ....
Is the reactivity of an alloy very different from the reactivity of its major component?"
Germanium is a semiconductor
germanium reacts naturally
Germanium is Ge.
No, germanium is very brittle.
Yes, germanium is an element.