Octet Builder

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Instructions

  • Every element shows its real electron shells. The dashed amber ring is the valence shell — only those electrons bond.
  • Tap an element below to add it to the workspace.
  • Drag two atoms together — when they touch, a popup lets you choose how to bond them.
  • Tap an atom by itself to give it a lone pair, remove it, or see nearby bonding options again.
  • Ionically bonded atoms (like Na+ and Cl−) stay attached — drag one and its partner follows.
  • Tap Check any time — a popup shows each atom's outer-shell electron count.

Learn More!

Key Concepts

Learn about the octet rule and how atoms form covalent and ionic bonds to fill their valence energy levels (valence shells).