Electronic Configuration
Electronic configuration refers to the arrangement of electrons in different energy levels, shells, and subshells of an atom. It helps in understanding the chemical behavior, reactivity, and position of elements in the periodic table. Each electron occupies a specific orbital according to well-defined rules.
Aufbau Principle
According to the Aufbau principle, electrons fill orbitals starting from the lowest energy level to higher energy levels. This ensures maximum stability of the atom.
Pauli Exclusion Principle
This principle states that no two electrons in an atom can have the same set of four quantum numbers. Therefore, an orbital can hold a maximum of two electrons with opposite spins.
Hund’s Rule
Hund’s rule states that electrons occupy degenerate orbitals singly first, with parallel spins, before pairing occurs. This minimizes electron repulsion and increases stability.
Orbitals and Subshells
Electrons are arranged in subshells such as s, p, d, and f, each having a specific number of orbitals and electron capacity. The distribution of electrons among these subshells determines the electronic structure of an element.
