Electron Configuration Principles

The page explains the Aufbau principle and its application in determining electron configurations.

Definition: The Aufbau principle guides electron placement in orbitals following specific rules.

Example: The configurazione elettronica follows diagonal rules for filling orbitals in order of increasing energy.

Highlight: Orbitals are filled according to the Pauli principle, allowing maximum two electrons with opposite spins.

Lewis Configuration and Valence Electrons

This section covers Lewis structures and valence electron concepts.

Definition: Valence electrons are those in the outermost incomplete energy level.

Example: The configurazione elettronica carbonio shows four valence electrons arranged in Lewis structure.

Highlight: Hund's principle states that electrons in equivalent orbitals first occupy them singly before pairing.

Introduction to Quantum Numbers

This section introduces the fundamental concept of quantum numbers and their role in describing electron properties. The material explains how Schrödinger's equations are used to define orbitals and electron behavior.

Definition: Orbitals are regions of space where electrons are most likely to be found, defined by Schrödinger's wave equations.

Highlight: The four quantum numbers are principal (n), secondary (ℓ), magnetic (m), and spin (ms).

Example: The principal quantum number (n) ranges from 1 to 7 in non-excited atoms, indicating energy levels.

Vocabulary: The secondary quantum number (ℓ) determines orbital shapes and can take values from 0 to (n-1).