Classification of elements
The following image represents Modern Periodic table. In the table, elements are placed according to their metallic and non–metallic properties. It has 18 groups (vertical arrangement) and 7 periods (horizontal arrangement). Metalloids occupies the intermediate portion between metals and non–metals. Daniel line separates the metalloids from metals
| Properties | Metals | Non-metals | Metalloids |
|---|---|---|---|
| Examples | Most of elements | B, O, N, F, Cl, I, Br, P, Se, & H | Si, Ge, As, Sb, Te, & At |
| State | Solid (except Mercury & Gallium) | Solid, liquid or gas (Only Bromine is liquid.) | Gases, volatile liquids or solids |
| Lustre (metallic shine) | All metals have lustre | Have no lustre (except Iodine & Graphite) | Have no lustre |
| Malleability (property due to which a substance can be beaten into sheets) | Highly malleable (except Zinc, Antimony & Arsenic) | Non malleable | Brittle (in case of solids) |
| Ductility (property by which a substance can be drawn into wire) | Ductile (except Zinc, Arsenic & Antimony) | Non ductile (excpet Carbon fiber) | Brittle (in case of solids) |
| Heat and Electrical conductivity | Good | Poor | Dual |