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Non-metals with a d-subshell are able to have expanded octets. For instance, elements 13-17 can have expanded octets. You’ll know to draw an expanded octet when the central atom is bonded to more than 4 elements. The elements that are metals (transition metals included) will tend to give away electrons, and therefore won’t have expanded octets. A hypervalent molecule (the phenomenon is sometimes colloquially known as expanded octet) is a molecule that contains one or more main group elements apparently bearing more than eight electrons in their valence shells.
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Compound words represent one of the most typical and specific features of English word-structure. Compounds are not always easy to distinguish from free word-combinations.Exceptions to the Octet Rule There are three classes of exceptions to the octet rule: • Molecules with an odd number of electrons; • Molecules in which one atom has less than an octet; • Molecules in which one atom has more than an octet. Odd Number of Electrons • Few examples. Generally molecules such as ClO 2, NO, and NO 2 have an Although the O atom has an octet of electrons, the N atom has only seven electrons in its valence shell. Although NO is a stable compound, it is Electron-deficient molecules represent the second violation to the octet rule. These stable compounds have less than eight electrons around an atom...
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Examples of molecules in which the central atom contains an expanded octet are the phosphorus pentahalides and sulfur hexafluoride.
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Two of these that are important for living systems are sulfur and phosphorus. By the octet rule, sulfur can make 2 covalent bonds and phosphorus 3 covalent bonds. Sulfur can also have expanded orbitals to accept 4 or 6 covalent bonds, and phosphorus can expand to 5 covalent bonds. 38. Which one of the following molecules has an atom with an expanded octet? A) HCl B) AsCl5 C) ICl D) NCl3 E) Cl2. Ans: B . 39. Which molecule has a Lewis structure that does not obey the octet rule? A) N2O B) CS2 C) PH3 D) CCl4 E) NO2. Ans: E . 40. Write the Lewis dot symbol for the chloride ion. Ans: 41.
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There are two important peculiarities distinguishing compounding in English from compounding in other languages. One more specific feature of English compounding is the important role the attributive syntactic function can play in providing a phrase with structural cohesion and turning it into...4. We have drawn a general outline of the division of the lexicon into part of speech classes developed by modern lin-guists on the lines of traditional morphology. It is known that the distribution of words between different parts of speech may to a certain extent differ with different au-thors.