Often asked: How many of the following elements can form compounds with an expanded octet?

Which elements can form compounds with an expanded octet?

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.

Which elements Cannot have an expanded octet?

These elements include hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon. Elements that cannot have an expanded octet are: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.

Can Li form compounds with an expanded octet?

Group 3 and below non metals like phosphorus can hold an expanded octet because of their d orbitals. Elements like Li, Be, He, and H typically have less than an octet. With Boron, the only way to know if it will have an octet is to check formal charge. The same thing goes for expanded octets.

Which elements can have expanded octets chegg?

Elements that possess d-orbitals in third principal energy levels shows expanded octets.

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Can I have an expanded octet?

The octet rule can be ‘expanded‘ by some elements by utilizing the d- orbitals found in the third principal energy level and beyond. Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet.

How does expanded octet work?

Expanded octet” refers to the Lewis structures where the central atom ends up with more than an octet, such as in PCl5 or XeF4. One can easily see that if the central atom, P, is to be joined to five Cl atoms, P would have 10 electrons instead of the octet.

Why can’t oxygen have an expanded octet?

Oxygen has no empty orbitals with it. It only possess orbitals upto 2p which contains 4 electrons. So it cannot expand its octet by exiting it’s electrons.

Which elements can break the octet rule?

There are three violations to the octet rule: odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.

What are the octet rule exceptions?

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 SF6; and. Molecules such as BCl3, in which one or more atoms possess less than eight electrons.

Why can Sulfur Form 6?

Sulfur has one more electron pair in its 3s subshell so it can undergo excitation one more time and place the electron in another empty 3d orbital. Now sulfur has 6 unpaired electrons which means it can form 6 covalent bonds to give a total of 12 electrons around its valence shell.

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Why does bf3 violate the octet rule?

Electron-deficient molecules. Boron commonly makes only three covalent bonds, resulting in only six valence electrons around the B atom. A well-known example is BF 3: The third violation to the octet rule is found in those compounds with more than eight electrons assigned to their valence shell.

Why can phosphorus make 5 bonds?

Phosphorus can have expanded octet, because it can shift it’s lone pair electrons (3s orbital electrons) to empty 3d obital during excited state and thus can form 5 bonds.

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