A student is given a sample of an unknown substance. He is asked to determine if it is classified as a metal, a metalloid, or a nonmetal. He discovered that the unknown element forms amphoteric oxides and often behave as semiconductors. This element is most likely a ________.

metal

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non-metal

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metalloid

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cannot be determined

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Solution

The correct option is C metalloid
Metalloids are the elements which have the properties intermediate to those of metals and non-metals.
The general properties of metalloids include
1) They react with both acids and bases
2) They form amphoteric oxides.
3) They often behave as semiconductors.
Examples are germanium, silicon, etc.

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