Question

who give the best and short definition of metalloids

Answer 1

Hey there,
The answer:

The elements which have the properties of both metal and non metals are called metalloid
Example: Boron, Silicon

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Answer 2

Here is your answer....

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Elements which have properties in between those of metals and nonmetals are called metalloids or semimetals .
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for example ...... Silicon , Germanium , arsenic , antimony and tellurium

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These elements show some properties of metal and other properties of non metals.
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for example they look like metals but are brittle like non metals they are neither good conductors of electricity nor non conductors (insulators) like non metals. They are generally semi-conductors .

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Hope this helps you.......(^^)