Explain the octet rule. Mention the limitations.
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Another Explanation (5):
The octet rule states that atoms tend to gain, lose, or share electrons in order to have eight electrons in their valence shell (outermost electron shell), achieving a stable electron configuration similar to that of a noble gas.
| Limitations | Explanation |
|---|---|
| Incomplete Octet | Some atoms, like hydrogen (2 electrons) and boron (6 electrons), are stable with fewer than eight electrons. |
| Expanded Octet | Elements in period 3 and beyond can have more than eight valence electrons due to the availability of d orbitals. Examples include phosphorus pentachloride (PCl5) and sulfur hexafluoride (SF6). |
| Odd-Electron Molecules | Molecules with an odd number of electrons, like nitrogen dioxide (NO2), cannot satisfy the octet rule for all atoms. |