Question

what is orbita and sub shell and quantum theory???

Answer 1

An atomic orbital is a mathematical function that describes the wave-like behavior of either oneelectron or a pair of electrons in an atom. and more over  sun shell is nothing but  is a set of electrons that all have the same value of (azimuthal quantum number). You can think of as a label for a group of orbitals . quantum theory-a theory of matter and energy based on the concept of quanta, especially quantum mechanics.  HOPE IT WOULD BE HELPFUL 2 U:)

Answer 2

Each shell is composed of one or more subshells   example the first (K) shell has one subshell, called 1s; the second (L) shell has two subshells, lke  3s, 3p, and 3d;  4s, 4p, 4d and 4f; s 5s, 5 are sub shell.
An atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom..
a theory of matter and energy based on the concept of quanta, especially quantum mechanics..........