What is the 2 8 8 18 18 32 rule?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The 2-8-8-18-18-32 rule explains how electrons are arranged in different shells around an atom’s nucleus. Each shell has a maximum capacity: the first holds 2 electrons, the second 8, the third 8 (in basic models), followed by shells that can hold 18, 18, and 32 electrons.
This rule is commonly used in early chemistry education to help students understand atomic structure and chemical behavior. It provides a simple way to predict valency and reactivity, even though advanced chemistry uses more detailed quantum models.
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