Source: wikibot/principal-quantum-number
= Principal quantum number
{wiki=Principal_quantum_number}
The principal quantum number, denoted as \\( n \\), is a fundamental quantum number used in quantum mechanics to describe the energy levels of electrons in an atom. It provides information about the size and energy of an electron's orbital. Here are some key points about the principal quantum number: 1. **Definition**: The principal quantum number indicates the main energy level (or shell) occupied by an electron.