**ORBIT / SHELL****:**

Do you Know !!

What is a shell?

Shell is a well-defined circular path in which electron revolves around the nucleus of an atom.

Shell is also known as orbit or energy level .

**Atomic Shell is denoted by n.**

where n=1 represent the 1st shell ,denoted by K

n=2 represent the 2nd shell ,denoted by L

n=3 represent the 3rd shell ,denoted by M and so on….

**Maximum no. of electrons in atomic shells (n) are as follow:**

K-shell=2 e-

L-shell=8 e-

M-shell=18 e- and so on….

Formula to calculate maximum number of electrons in atomic shells:

**MAX. NO OF ELECTRONS IN A SHELL= 2n **^{2}

^{2}

**What is meant by sub-shell?**

**Subshell:**

^{A subshell is a sub division of atomic shells(orbit) separated by electron orbitals.}

*Subshell *also known as ** sub orbit **or

*sub energy level.**Sub shells are denoted by:*

s (sharp)

p (principle)

d (diffuse)

f (fundamental)

* ORBITALS:*

*ORBITALS:*

**It is a three dimensional probability space (along x y and z-axis)around the** **nucleus of an atom where the possibility of finding the** **electron cloud is maximum (95%).**