No, it is not a metalloid. Plutonium is a metal, as are the other elements in the actinide series.
Polonium has properties of both metals and non metals. It is hence considered to be a metalloid.
Uranium is a metal, rather than a nonmetal, or metalloid.
No, polonium is a solid metalloid.
Nails are metal.
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Polonium is considered now as a metal.
Polonium is usually considered a poor metal, but can also be considered a metalloid.
Silicon is a metalloid.