Nonmetals display extra variability in their properties than the metals. These properties are mainly determined by molecular structures of the nonmetals involved and the interatomic bonding strengths, both of which are subject to the difference as the number of valence electrons in each nonmetal differs. Metals, in contrast, have additional homogenous structures and their properties are more easily submissive.
In the periodic table as you see on the leftmost nonmetals on the table are metalloids such as silicon, boron, and germanium, which usually behave chemically like nonmetals, and are comprised here for comparative purposes. In this sense, they can be observed as the most metallic of nonmetallic compounds.
The 7 metalloids are silicon (Si), germanium (Ge), boron (B), arsenic (As), tellurium (Te), antimony (Sb), and astatine (At). On a regular periodic table, they occupy a transverse area in the p-block spreading from boron at the upper left to astatine at lower right, along with the separating line between metals and nonmetals displayed on some periodic tables. They are known as metalloids mainly in light of their physical appearance to metals.
They have a various range of distinct physical and chemical properties. In periodic table terms, they mainly occupy a position among the weakly nonmetallic metalloids to the left and the noble gases to the right.
6 nonmetals are categorized as noble gases: Neon (Ne), helium (He), krypton (Kr), argon (Ar), xenon (Xe), and the radioactive radon (Rn). In periodic table terms, they take the outermost right column. They are known noble gases in light of their typically very low chemical reactivity.