Moderate

A term in which no two electron can have the same set of four Quantum numbers is stated by

Correct answer: B. Pauli's exclusion principle

  • A. Heisenberg's principle
  • B. Pauli's exclusion principle
  • C. Aufbau principle
  • D. Hund's rule

Explanation

The heisenberg uncertainty principle states that certain pairs of physical properties, such as position and momentum, cannot be precisely determined simultaneously with arbitrary accuracy. Mathematically, the uncertainty principle is expressed as follows: (Δx . Δp ≥ h/4π) Hence, this is the incorrect answer. This is the correct answer because, The Pauli exclusion principle states that each electron in an atom must have a unique combination of quantum numbers. The four quantum numbers that describe an electron are: The principal quantum number (n) which determines the energy level or shell of the electron. The azimuthal quantum number (l) which specifies the subshell or orbital angular momentum of the electron. The magnetic quantum number (mₗ) which specifies orientation in space of a given orbital of particular energy and shape. The spin quantum number (mₛ) which specifies the spin state of an electron. The Aufbau principle, also known as the "building-up principle". According to the Aufbau principle, electrons occupy the lowest energy orbitals available first before moving to higher energy levels. The principle is based on the idea that electrons exist in discrete energy levels or shells surrounding the nucleus of an atom. Hence, this is the incorrect answer. Hund's rule states that when electrons are filling degenerate orbitals (orbitals with the same energy), they will occupy separate orbitals within the subshell before pairing up. In other words, electrons will try to maximize the number of unpaired electrons in a subshell or orbital before pairing begins. This principle is based on the concept of electron-electron repulsion. Hence, this is the incorrect answer.

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