Chapter 14

Atomic Stability Rules

Exploring how atoms achieve energy balance.

Duplet and Duplet Rule

In the atom of helium, there is only one shell (K-shell). It is the first and last shell of the helium atom.

Capacity Calculation (2n²)

For K-shell (n = 1):
Capacity = 2 × (1)² = 2 × 1 = 2 electrons

The state of becoming stable by attaining two electrons in a K-shell is called the duplet state.

Except for helium, all other inert gases like Neon (Ne), Argon (Ar), and Krypton (Kr) have 8 electrons in their valence shell.

L-Shell Maximum Capacity

For L-shell (n = 2):
Capacity = 2 × (2)² = 2 × 4 = 8 electrons

The state of bearing 8 electrons in the outermost shell of an atom is called the octet state.

Elements with fewer than 8 electrons will lose, gain, or share electrons to reach this stable arrangement.

Interactive Atomic Simulator

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Select a stability rule from the left panel to begin visualization