The periodic table is a conglomerate of the elements found so far, they are grouped according to their physical and chemical properties. In the periodic table found groups that indicate the valence electrons of the elements, so group I, groups elements with one valence electron and group VI groups elements with 7 valence electrons. Let's see then a scheme of the periodic table and how its properties change throughout it.
Metalloids are chemical elements with intermediate properties between metals and non-metals. Although there is no precise definition, metalloids tend to have two general properties: 1) they are semiconductors of electricity and 2) they form amphoteric oxides.
In ascending order based on atomic weight, the following elements are considered metalloids: boron, silicon, germanium, arsenic, antimony, tellurium, and polonium; arsenic