Which one of the following is not a metalloid

Boron

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Silicon

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Gallium

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Germanium

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Solution

The correct option is C
Gallium

The explanation for the correct option:
C) Gallium is a metal
The explanation for the incorrect option:
Metalloids show the property in between metals and non-metals
Examples include: Boron, silicon, germanium, arsenic, antimony, and tellurium
(A), (B), and (D) are metalloids
Thus, option (C) i.e gallium is a metal, not a metalloid

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