Question

List of elements that are exceptions to the octet rule

Answer 1

Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet.

Phosphorus pentachloride (PCl5) and sulfur hexafluoride (SF6) are examples of molecules that deviate from the octet rule by having more than 8 electrons around the central atom.

Hydrogen, lithium, boron and aluminium are having less than 8 electrons around the central atom.

Answer 2

halogens, oxygen, nitrogen, fluorine, and carbon.

• Too few electrons exist in hydrogen, beryllium, and boron for them to form an octet. There is just one location where hydrogen may make a bond with another atom and only one valence electron.
• Beryllium can only establish electron pair bonds in two places since it only has two valence atoms.
• The octet rule has three standard exceptions:
• molecules with an odd number of electrons, such as NO;
• molecules like SF6 that include one or more atoms with more than eight electrons;
• molecules with one or more atoms that have fewer than eight electrons, such as BCl3.
• The following are the few elements that defy the octet rule: Lithium, phosphorus, sulphur, and hydrogen.

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