GENERAL KNOWLEDGE

Detailed explanation-1: -Pauli’s Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposite spins (Figure 46(i) and (ii)).

Detailed explanation-2: -It is called the exclusion principle because, according to this principle, if one electron in an atom has the same particular values for the four quantum numbers, then all the other electrons in that atom are excluded from having the same set of values.

Detailed explanation-3: -What is Pauli Exclusion Principle? The Pauli exclusion principle states that in a single atom no two electrons will have an identical set or the same quantum numbers (n, l, ml, and ms). To put it in simple terms, every electron should have or be in its own unique state (singlet state).

Detailed explanation-4: -An example is the neutral helium atom, which has two bound electrons, both of which can occupy the lowest-energy (1s) states by acquiring opposite spin; as spin is part of the quantum state of the electron, the two electrons are in different quantum states and do not violate the Pauli principle.