Question

How many quantum numbers are rquired to specify the position of eletron:-

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (D)

4

There are $4$ quantum numbers necessary.
$1-$ Principle Quantum number(n)
The principal quantum number is one of four quantum numbers which are assigned to all electrons in
an atom to describe that electron's state.
$2-$ Azimuthal Quantum number(p)
The angular momentum quantum number, l, (also referred to as the secondary quantum number or
azimuthal quantum number) describes the shape of the orbital that an electron occupies. The lowest
possible value of l is 0, and its highest possible value, depending on the principal quantum number, is $n-1$
$3-$ Magnetic Quantum number(m)
The magnetic quantum number, designated by the letter mₗ, is the third in a set of four quantum
numbers which describe the unique quantum state of an electron.
$4-$ Spin Quantum Number(s)
The spin quantum number is a quantum number that parameterizes the intrinsic angular momentum
of a given particle. The spin quantum number is the fourth of a set of quantum numbers, which
completely describe the quantum state of an electron. It is designated by the letter $s.$