Q. Which of the following elements is dull and brittle?
Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.
Q. What metal is dull and brittle?
Nonmetals
Q. Which elements are shiny or dull?
Properties
| Metals | Non-metals | |
|---|---|---|
| Appearance | Shiny | Dull |
| State at room temperature | Solid (except mercury, which is a liquid) | About half are solids, about half are gases, and one (bromine) is a liquid |
| Density | High (they feel heavy for their size) | Low (they feel light for their size) |
| Strength | Strong | Weak |
Q. What elements are considered brittle?
Q. Is magnesium shiny or dull?
Magnesium is a shiny, silver or gray colored metal that is light in weight and strong. Th density of magnesium is 1.738 g/mL, which means the metal will sink in water, but it is still relatively light weight.
Q. Is fluorine shiny or dull?
Fluorine is a non metal and gas therefore is not shiny or dull.
Q. Is iodine shiny or dull?
Uses and properties A black, shiny, crystalline solid. When heated, iodine sublimes to form a purple vapour.
Q. Why does graphite and iodine shine?
The reason for the shine emitted by graphite is the reflection from the lattice structure, property of non-luster of non-metal.
Q. Is boron shiny or dull?
Boron is allotropic and exists as a powder or a metal-like substance. Its color ranges from a dark brown to black powder or a jet-black to silver-gray metal-like element. Its crystalline form is very hard, lustrous, but brittle.
Q. What is the classification of dull?
The nonmetals include the nonmetals element group, plus the halogens, and noble gases. Properties of nonmetals include: Dull, not shiny. Poor conductor of heat.
Q. Is phosphorus shiny or dull?
Ordinary phosphorus is a waxy white solid. It is colorless and transparent in its pure form. Phosphorus is insoluble in water, but soluble in carbon disulfide.
Q. How does phosphorus exist in nature?
Phosphorus is not found uncombined in nature, but is widely found in compounds in minerals. An important source is phosphate rock, which contains the apatite minerals and is found in large quantities in the USA and elsewhere. This produces phosphorus as a vapour, which is then collected under water.
Q. Is Radium shiny or dull?
A soft, shiny and silvery radioactive metal. Radium now has few uses, because it is so highly radioactive.
Q. Is arsenic shiny or dull?
Arsenic occurs in two allotropic forms. The more common form of arsenic is a shiny, gray, brittle, metallic-looking solid.
Q. Is Zinc shiny or dull?
Pure zinc is a shiny bluish-white colored metal, while commercial grades of the metal usually have a dull finish to it.
Q. What makes an element shiny?
The electrons that are farthest from the nucleus give a metal its shine. Light reflects, or bounces off, these outer electrons. This makes the metal appear shiny. This shiny appearance on the surface of some metals is called luster.
Q. Why is gold so shiny?
The surface of a metal can absorb all wavelengths of incident light, and excited electrons jump to a higher unoccupied energy level. So, most of the incident light is immediately re-emitted at the surface, creating the metallic luster we see in gold, silver, copper, and other metals.
