Читать книгу Foundations of Chemistry - Philippa B. Cranwell - Страница 116

You may have noticed the phosphorus atom now has 10 outer electrons, which is two more than the accepted octet. Phosphorus is said to ‘expand the octet’ by accommodating more than eight electrons in its outer shell. The term for this behaviour is hypervalency, and several theories have been used to explain it. A discussion of hypervalency is beyond the scope of this textbook, but it should be noted that you could also encounter hypervalency when looking at bonding in the elements sulfur, chlorine, and iodine.