Max # of electrons in an orbit

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what is the maximum number of electrons allowed in each of the first 5 orbits of an atomic particle? Is it the same for all elements? or do different ones hove a different maximum numver of electrons possible of being in an orbit?
 
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Don't say atomic particle. Just call it an atom.

Have you heard of the 2{n}^{2} rule. That's the maximum number of electrons in the {n}^{th} orbit. It is the same for all elements.
 
graphene said:
Don't say atomic particle. Just call it an atom.

Have you heard of the 2{n}^{2} rule. That's the maximum number of electrons in the {n}^{th} orbit. It is the same for all elements.

Thank you, that equation was exactly what I was wanting, I figured it out once about 7-6 years ago when I was reading a book on quantum physics and couldn't remember it so I was going to try to figure it out again but you have saved me the trouble. Thanks again.
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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