Solid's molecules have very high attraction forces, so the particles stay together and vibrate rather than any strong motion. Liquids have pretty strong attraction forces, but because they are weaker than solids, particles can move more freely, so they can slide against each other rather than vibrate. Gases have the least strong attraction forces compared to the two, so they can move everywhere, and as you know, gas is not constricted and it is everywhere, so gas is the answer.
Silicons are used in our day to day technology products. It is used to use micro chips and motherboards and other components on nanotechnology. <span />
Metallurgy is the science and technology of metals and alloys. The study of metallurgy can be divided into three general groups: ... Process metallurgy is concerned with the extraction of metals from their ores and the refining of metals.
Answer:
Energy levels : It refers to the shells of definite energy in which electron revolves around the nucleus .
Explanation:
As we know, that atom consist of small dense mass that is nucleus and around it the shells of definite energy are present .
We also know ,atom consist of sub atomic particles that is :
- In shells the electrons are present and are not stationary (they are revolving ).
- The electron never absorbs or releases energy by itself .The electron in shells have definite energy that is the reason the shells are referred as energy levels .
- But, when we supply energy to electron which is more than the energy of the shell then it gets excited to higher energy level (depending upon magnitude of energy supplied ).
- The higher energy level is regarded as excited state .
- The excited states are always unstable .
- So, electron revolves there for short span of time but ultimately it returns to its own shell and by doing so it release the energy absorbed by it .
- The energy released is actually a difference in the energy of ground state (original state ) and energy of excited state .
- ΔE=E₂-E₁