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Hydrogen is not a metalloid because hydrogen is not a soft solid at room temperature and pressure. In order to be a metalloid, a minimum requirement is that the element must have a reasonably well-defined shape. That is, it must be a solid with properties between those of a nonmetal and a metal.
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Because it is non metal and according to definition of metalloid the metal which has both the property of metal and non metal and hydrogen is only a non metal so it is not metalloid.
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