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The Octet Rule is violated in these three scenarios: When there are an odd number of valence electrons; When there are too few valence electrons; When there are too many valence electrons; Reminder: Always use the Octet Rule when drawing Lewis Dot Structures, these exceptions will only occur when necessary.
The octet rule is a chemistry rule of thumb that says that atoms combine in a way that gives them eight electrons in their valence shells. This achieves a stable electron configuration similar to that of noble gases.
There are three violations to the octet rule: odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.
However, there are three general exceptions to the octet rule: Molecules, such as NO, with an odd number of electrons; Molecules in which one or more atoms possess more than eight electrons, such as SF 6; and. Molecules such as BCl 3, in which one or more atoms possess less than eight electrons.
Although they are few, some stable compounds have an odd number of electrons in their valence shells. With an odd number of electrons, at least one atom in the molecule will have to violate the octet rule. Examples of stable odd-electron molecules are NO, NO 2, and ClO 2.
Hydrogen, beryllium, and boron have too few electrons to form an octet, rendering them an octet rule exception. Hydrogen has only one valence electron and only one place to form a bond with another atom.
With an odd number of electrons, at least one atom in the molecule will have to violate the octet rule. Examples of stable odd-electron molecules are NO, NO 2, and ClO 2. The Lewis electron dot diagram for NO is as follows: Although the O atom has an octet of electrons, the N atom has only seven electrons in its valence shell.
The molecules of the halogens, oxygen, nitrogen, and carbon are known to obey the octet rule. In general, the elements that obey this rule include the s-block elements and the p-block elements (except hydrogen, helium, and lithium).
There are three violations to the octet rule: odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.
With an odd number of electrons, at least one atom in the molecule will have to violate the octet rule. Examples of stable odd-electron molecules are NO, NO 2, and ClO 2. The Lewis electron dot diagram for NO is as follows: Although the O atom has an octet of electrons, the N atom has only seven electrons in its valence shell.