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Why are tin and lead not used as semiconductor?
because they are not semiconductors. They are metals and rather good conductors.
Are metalloids metals?
No. They have a superficial resemblance to metals as they look shiny. However in other respects they are quite different . They are brittle rather than ductile; semiconductors rather than good conductors. They do form ionic compounds where they are cations, but generally form covalent compounds. However there are compounds where they form anions when reacted with highly electropositive metals.
Why is it difficult to determine electron affinities for metals?
Most metals, especially those in the alkali and alkaline groups, want to form cations by giving away rather than forming anions by assuming an electron from another atom. For this reason, it is difficult to measure the electron affinities of metals.
Why are alkali metals more reactive than transition metals?
Groups 3-12 do not have individual names. Instead, all of these groups are called transition metals. The atoms of transition metals do not give away their electrons as easily as atoms of the Group 1 and Group 2 metals do. So, transition metals are less reactive than alkali metals and alkaline-earth metals are.
What are alloy brakes?
Alloy just means that the brakes aren't mad out of one pure metal, but rather of a homogenous mixture of metals - an alloy.
What is soft and hard iron?
One can deform a bar of iron elastically i.e. after the forces on the bar are removed , the iron bar will move back into its original, non deformed shape. You can already guess that there is a limit to elastically loading such an iron bar. Too large a force will deform the bar plastically or, in simpler words, forever. Back to flexible. I understand your question is about elasticity and iron has it to a limit.
Why knit fabric has stretchability?
Knitting arranged yarn into complex shapes rather than straight lines. The shapes can deform, which would not happen if the yarn was linear.
Why is it better to refer to the costs rather than values of assets such as plant or inventories?
The values of assets such as plants or inventories can change elastically. Using costs instead of values for elastic assetsÊis more accurate for calculating expenses.
Are most metals electrical insulators?
No, most metals are electrical conductors. This means that most metals will conduct an electric current in the presence of an electric field.
What happends to valence electrons in an ionic bond?
In bonds between metals and non- metals thety are transferred rather than shared
What is one property of alkaline metals?
All of the alkaline earth metals are naturally occurring and they share similar properties: they are all rather reactive metals under standard conditions.
Why do you think the most commonly used metal objects of transitional metals rather than alkali metals or alkaline earth metals?
Alkali and alkaline earth metals are too chemically reactive to stay in metallic form.
Why are tin and lead not used as semiconductor?
because they are not semiconductors. They are metals and rather good conductors.
What are some ductile materials?
Materials that are ductile, or have the property of ductility, will stretch and deform when they are pulled, rather than breaking. Gold, silver, copper, iron, and lead are common examples of ductile materials.
Are metalloids metals?
No. They have a superficial resemblance to metals as they look shiny. However in other respects they are quite different . They are brittle rather than ductile; semiconductors rather than good conductors. They do form ionic compounds where they are cations, but generally form covalent compounds. However there are compounds where they form anions when reacted with highly electropositive metals.
How is the electron affinity related to metallic character?
metals lose electrons rather than gain them
How is electron affinity related to metallic character?
metals lose electrons rather than gain them
