Duplet state is when an element has two electrons in its outermost shell. Example: Helium (2): Electronic configuration is 2. So, helium has 2 electrons in the outermost shell. That is helium is in its duplet state.

What is Duplet and octet structure?

The key difference between octet and duplet is that octet is an atom or an ion having a maximum of eight electrons in the outermost shell while duplet is an atom having the maximum of two electrons in the outermost shell.

What is the Duplet rule?

Duplet rule states that an element is stable if its atom has 2 electrons in its valence shell and to attain this state, elements lose, gain or share electrons and form chemical bonds. This rule is also called the duet rule. The only elements known to follow the this rule are Hydrogen, Helium and Lithium.