Which elements do not follow ther Octet Rule? Xenon Copper Helium Hydrogen

The elements that do not follow the Octet Rule are:1. **Helium (He)**: Helium has only one electron shell, which can hold a maximum of 2 electrons. Therefore, helium is stable with 2 electrons in its outer shell and does not follow the Octet Rule.2. **Hydrogen (H)**: Hydrogen has only one electron shell, which can hold a maximum of 2 electrons. Therefore, hydrogen is stable with 2 electrons in its outer shell and does not follow the Octet Rule.3. **Xenon (Xe)**: Xenon is a noble gas with a complete outer electron shell, making it stable and not needing to follow the Octet Rule.4. **Copper (Cu)**: Copper is a transition metal and often forms compounds where it does not achieve a full octet in its outer shell. For example, in copper(I) oxide (Cu2O), copper has an oxidation state of +1, which means it has only one electron in its outer shell, not following the Octet Rule.In summary, helium, hydrogen, xenon, and copper are elements that do not follow the Octet Rule.