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Metalloids are the elements which show some properties of metals as well as some properties of non-metals.
Eg: Antimony (Sb) , Germanium (Ge) etc.
An explanation:
Germanium is a good conductor of electricity (metallic property) 
On the other hand
Germanium Oxide (GeO _{2} is acidic in nature (non-metallic property).
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Metalloids are the elements that have both the properties of metal n non metal...
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