Explain about orbit,sub orbit,shell,sub shell and orbital.

plz give me full explanation about it.

 shell:- In simplest terms a shell is an environment to run in, like DOS command, Korn Shell, etc. You have access to muliple programs that you can run to accomplish tasks (cat, man, etc.). 

Most shell programs support a scripting language (e.g,. DOS - very poor, Korn - much better) that provides you that ability to development complex commands for automating activities.

The power and richness of the shell environments makes it easy to manage and control system.

  SUBSHELL-Electron shells are made up of one or more electron subshells, or sublevels, which have two or more orbitals with the same angular momentum quantum number l. Electron subshells are identified by the letters s, p, d, f, g, h, i, etc., corresponding to the azimuthal quantum numbers (l-values) 0, 1, 2, 3, 4, 5, 6, etc. Each shell can hold up to 2, 6, 10, 14, 18, 22 and 26 electrons respectively, or 2(2l + 1) electrons in each subshell. The notation 's', 'p', 'd', and 'f' originate from a now-discredited system of categorizing spectral lines as "sharp", "principal", "diffuse", or "fundamental", based on their observed fine structure. When the first four types of orbitals were described, they were associated with these spectral line types, but there were no other names. The designations 'g', 'h', and so on, were derived by following alphabetical order.