Explain all 4 quantum no.s with …

There are a total of 4 quantum numbers :

1) Principal Quantum number (n)

The principal quantum number, n, designates the principal electron shell.

n=1 means the electron is in the innermost shell i.e K shell

n=2 represents the position of electron in L shell   and so on. 

2) Orbital angular quantum number (l)

The orbital angular momentum quantum number l determines the shape of an orbital.

eg. If n=3 possible values of l are 0,1,2

3) Magnetic quantum number (m_l)

The magnetic quantum number m_l determines the number of orbitals and their orientation within a subshell.Given a certain l, m_l is an interval ranging from –l to +l, so it can be zero, a negative integer, or a positive integer.

4) Electron spin quantum number (m_s)

It designates the direction of the electron spin and may have a spin of +1/2, represented by↑, or –1/2, represented by ↓. This means that when m_s is positive the electron has an upward spin, which can be referred to as "spin up." When it is negative, the electron has a downward spin, so it is "spin down."