Question

Which rule is not followed by the configuration?

A. Hund’s rule
B. Aufbau rule
C. Pauli’s rule
D. (n + 1) rule

Answer 1

Hint: We are given an image in the question. We will check the image and find out which law is not followed by the given configuration. The options have Hund’s law, Aufbau law, Pauli’s law and (n+1) rule.

Complete step-by-step answer:
Hund's Rule of Maximum Multiplicity rule states that for a given electron configuration, the term with maximum multiplicity falls lowest in energy. According to this rule electron pairing in p, d and f orbitals cannot occur until each orbital of a given subshell contains one electron each or is singly occupied.
Aufbau principle tells us that the lowest energy orbitals get filled by electrons first. After the lower energy orbitals are filled, the electrons move on to higher energy orbitals.
The Pauli Exclusion Principle is the quantum mechanical principle which states that two or more identical fermions (particles with half-integer spin) cannot occupy the same quantum state within a quantum system simultaneously.
In the image we can see one of the orbitals has two electrons in parallel spin. So pauli’s exclusion principle is not followed.

Additional information: Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

So the correct option is C. Pauli’s rule.

Note: The law for the structure of atoms are important. The English chemist John Dalton suggested that all matter is made up of atoms, which were indivisible and indestructible. He also stated that all the atoms of an element were exactly the same, but the atoms of different elements differ in size and mass.