Why are metalloids located on the periodic table?
Do you mean where or why?
Let us look at the Table...
Now most of the 100 of so elements are METALS... The non-metals are confined to the RIGHT of the Table as we face it; there are 15 or so; the blue triangle, and the yellow and gold Groups. The elements that are pea-green in colour, boron, silicon, germanium, arsenic, etc. are metalloids. And these have intermediate properties with respect to metals and non-metals.