Metalloid — উপধাতু
A metalloid is an element straddling the boundary between metals and nonmetals — not quite either.
Definition
Metalloids sit along the staircase line that divides metals from nonmetals — boron, silicon, germanium, arsenic, antimony and tellurium are the usual six. They look like metals but bond more like nonmetals, and their signature trick is semiconducting: they conduct electricity meekly, and better when warmed or doped. That in-between behaviour makes them the hinge of modern technology. Silicon, the second most common element in Earth's crust after oxygen, turns sunlight into power on rooftops and carries logic inside every chip.
For example
Open any old radio or phone: the little black chips on the green board are silicon — a metalloid doing a job neither a true metal nor a nonmetal could.