6.1
Classification of Elements
| 6.1 | Classification of Elements |
| Definition |
| Molecules are neutral particles made up of two or more atoms. |
| Definition |
| Element is the simplest form of subtstance and cannot be divided to two or more simpler substances |
Example of element: Zinc, iron, oxygen
| Definition |
| Compound consists of two or more elements combined chemically |
Example of compound: Salt, shell and sugar
Differences between Metals and Non-metals
| Metals | Characteristics | Non-metals |
| Shiny | Appearance | Dull |
| Ductile | Ductility | Brittle |
| Malleable | Malleability | Non-malleable |
| High | Tensile strength | Low (break easily) |
| Good | Electrical conductivity | Poor (except carbon) |
| Good | Heat conductivity | Poor |
| High | Density | Low |
| High | Melting point and boiling point |
Low |
| Both are elements | ||
| Examples of metals and their characteristics | |
| Aluminium |
|
| Iron |
|
| Copper |
|
| Examples of non-metals and their characteristics | |
| Iodine |
|
| Chlorine |
|
| Carbon |
|
