Correct Answer - Option 1 : Pauli's principle
The correct option is Pauli's principle
Quantum Numbers: Quantum numbers are a certain set of numbers for an electron that signifies its position and energy.
The different quantum numbers for electron are
|Principle Quantum Number
||It signifies the principle orbital starting from n = 0. For example, the quantum number for K shell is 1, L is 2.
|Azimuthal Quantum Number
||It signifies the number of subshells in a given quantum Number. The different subshells are represented by s, p, d, f.
|Magnetic Quantum Number
||The motion of electrons produces a magnetic field that is signified by magnetic quantum number m. The number of magnetic quantum number is denoted as 2l +1, l is sub shell level. For s, l =0, p l =2, and so on.
|Spin Quantum Number
||The electron in an orbit revolves around the nucleus and spins on its axis. This represented by a spin quantum number. For two electrons in the same orbit, the direction of spin is opposite to each other.
- In an orbital, only two electrons can be present, both will be having opposite spins, and hence different spin quantum
- So, for two electrons in the same orbit, principle, azimuthal and spin quantum numbers can be the same, but the spin quantum number cannot be the same.
- Therefore, Pauli's principle states "No two electrons in an atom can have the same set of all the four quantum numbers"
Heisenberg's principle says it is impossible to predict the exact momentum and position of an electron in an atom at the same time.
Hund's rule states the lowest electronic configuration state has the maximum number of parallelly spinning electrons.
Aufbau principle: It states that electrons are filled in orbits according to the increasing order of the energy of the orbit.