Compare between metals and onmetals, in terms of : Electrical conductivity. Malleability, ductility and formability. Metallic luster.؟
إجابة الطالب المختصرة من خلال موقع بوابة الإجابات هي
1. Electrical Conductivity Metals: Good conductors of electricity. Non-metals: Poor conductors, generally insulators. Explanation: Metals allow free flow of electrons, while non-metals do not. 2. Malleability, Ductility, and Formability Metals: Malleable, ductile, and can be easily shaped. Non-metals: Brittle, not ductile or malleable.
Okay, let's compare metals and nonmetals based on the properties you've listed:
**Metals**
* **Electrical Conductivity:** Excellent conductors of electricity. This is due to the "sea of electrons" model, where electrons are delocalized and free to move throughout the metallic structure, carrying an electrical charge easily.
* **Malleability:** Highly malleable. Malleability refers to the ability of a metal to be hammered or pressed into thin sheets without breaking. The metallic bonds allow the atoms to slide past each other without disrupting the overall structure.
* **Ductility:** Highly ductile. Ductility refers to the ability of a metal to be drawn into wires. Similar to malleability, the metallic bonding allows atoms to rearrange and deform under tensile stress.
* **Formability:** Generally, easily formable. The ability to be formed depends on many factors such as temperature, pressure or stress. However, most metals can be cast, drawn, extruded, forged, or machined into various shapes.
* **Metallic Luster:** Possess a characteristic shiny appearance, called metallic luster. This is because the free electrons in the metal absorb and re-emit light at many frequencies, giving them a reflective surface.
**Nonmetals**
* **Electrical Conductivity:** Generally poor conductors of electricity (insulators). Their electrons are tightly bound to individual atoms and are not free to move and carry a charge. There are exceptions, such as graphite (a form of carbon), which is a good conductor due to its layered structure and delocalized electrons within those layers.
* **Malleability:** Generally brittle and non-malleable. They tend to shatter or crumble when hammered or pressed. The bonding in nonmetals (usually covalent) is directional and doesn't allow for the easy sliding of atoms past one another.
* **Ductility:** Generally non-ductile. They cannot be easily drawn into wires. Again, their bonding prevents the necessary deformation.
* **Formability:** Generally, difficult to form. Some nonmetals exist as gases or liquids at room temperature, making forming impossible. Solids nonmetals are generally brittle and cannot be formed using the same processes as metals. There are some exception such as polymers or plastics.
* **Metallic Luster:** Do not possess metallic luster. They tend to be dull and non-reflective. They lack the free electrons needed to absorb and re-emit light in the same way as metals.
**Summary Table**
| Property | Metals | Nonmetals |
|-----------------------|--------------------------|-----------------------------|
| Electrical Conductivity | Excellent | Poor (insulators) |
| Malleability | Highly Malleable | Brittle, Non-malleable |
| Ductility | Highly Ductile | Non-Ductile |
| Formability | Generally Easily Formable | Generally Difficult to Form |
| Metallic Luster | Present (Shiny) | Absent (Dull) |
**Important Considerations:**
* These are general trends. There are exceptions to these rules.
* Some elements, called metalloids or semi-metals, have properties intermediate between metals and nonmetals. They can sometimes conduct electricity under certain conditions (semiconductors). Examples include silicon and germanium.
* The properties of materials can be influenced by temperature, pressure, and the presence of impurities or alloys.
اذا كان لديك إجابة افضل او هناك خطأ في الإجابة علي سؤال Compare between metals and onmetals, in terms of : Electrical conductivity. Malleability, ductility and formability. Metallic luster. اترك تعليق فورآ.
